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Which of these answers is true for the following equations4x - 5y = 08x - 10y = 15?
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If you invested 7000 in two accounts paying 6 percent and 8 percent annual interest respectively If the total interest earned for the year was 520 how much was invested at each rate?
.06x+.08y=520 x+y=7000 solve for either the x or y in the x+y=7000 problem: y=7000-x now subsitute your new equation in for y: .06x+.08(7000-x)=520 now solve: .06x+560-.08x=520 -560 -560 .06x-.08x=-40 -.02x=-40 -.02 -.02 x=2000 then plug x into your x+y=7000 equation: 2000+y=7000 y=5000 SOOO, x=2000 @ 6%, y=5000 @8%
What code goes in front of a southern Ireland mobile number from a scottish landline?
The Irish mobile number will be something like 08X XXX XXXX. You need to dial it in full international format, though, which means: 00 = international access prefix from UK 353 = country code for Ireland 8X = Irish mobile prefix, dropping the leading '0' trunk code XXX XXXX = the rest of the mobile number
How do you write a mobile phone number including Country Code and area code for Thailand?
The telephone country code for Thailand is +66, and mobile phone numbers begin with +66 8x, with 7 further digits. (The number is 08x plus 7 digits in domestic format.)To write the number in correct international format, it should look like this:+66 8x 123 4567Do not add any punctuation at all, except for the plus sign at the beginning. Do not include any dialing prefix (such as 00 66 or 08x). Do not try to put the number in a hybrid format (such as +66 (0)8x 123 4567).(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
How do i text from an English mobile to a Irish mobile?
Replace the trunk prefix 0 of the Irish mobile number with country code +353 (including the plus symbol).For example, 08x 1234567 becomes +353 8x 1234567.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
What is the correct mobile number format for Ireland?
The correct mobile number format for Ireland is +353, followed by the Irish mobile number without the leading 0. For example, if a mobile number in Ireland is 087 1234567, the correct format would be +353 87 1234567. The country code for Ireland is +353, which is necessary for international calls.
What is the area code to text English mobile from Ireland?
44 is the international country code for the UK (including England). To text a UK mobile phone from the Republic of Ireland dial '0044' or '+44'.. then the mobile number. Omit any zero from the start of the mobile number.
How would you work out the possible values of k when the line y equals x -8 is tangent to the curve y equals 4x squared plus kx plus 1?
Since the curves are tangent, they have the same slope at that point and the same x and y value at that point.Set equations equal and set slopes equal and solveTogetslope, you need to know calculus first derivativeslope of one equation is dy/dx = 8x +kand the othereqaution slope is dy/dx = 1so youhave4x^2 + kx + 1 = x -88x + k = 14x^2 +kx -x + 9 = 08x + k -1 = 0solve for kk = -11 or +13Another way but with the same answer:-If: y = 4x2+kx+1 and y = x-8Then: 4x2+kx+1 = x-8So: 4x2+kx-x+9 = 0For the line to be tangent with the curve the discriminant b2-4ac must = 0So if: -4*4*9 = -144 then (k-1)2 must = 144So it follows: (k-1)(k-1) = 144 => k2-2k-143 = 0Solving the quadratic equation: k = -11 or k = 13
What is the code to England if your ringing from Pakistan?
To ring from Ireland to England, use the country code +44 then the UK number (but leave out the leading zero); e.g., 01632 960123 becomes +44 1632 960123. To ring from England to Ireland, use country code +353, then the Irish number (again leaving out the leading zero); e.g., 01 123 4567 becomes +353 1 123 4567. In both cases, the plus sign means "insert your international access prefix here." The prefix is 00 from both Ireland and the UK.
What is the need for array variables?
Array variables are essential because an array is nothing more than a contiguous allocation of memory and we need some way to refer to both the memory itself and the objects within that memory. For that reason, array variables don't behave like ordinary variables: int x {42}; int y[10] {42}; In the above example, we've declared a single integer variable named x and an array of 10 integers named y. We've initialised both variables with the value 42 (the remaining 9 elements of y will be default initialised with the value 0). Both x and y are named variables, however x refers to an actual value (of type int) whereas y refers to the address of a value (of type int). We can see the difference if we print the address and value of each variable: printf ("Address of x: 0x%08x\n", &x); printf ("Value of x: %d\n", x); printf ("Address of y: 0x%08x\n", &y); printf ("Value of y: %d\n", y); Possible output: Address of x: 0x00e19000 Value of x: 42 Address of y: 0x00e19004 Value of y: 14782468 Note that the value of y is not 42 as you might expect. Here, 14,782,468 is the decimal equivalent of 0x00e19004, which is the address of y (in hexadecimal). Both y and &y refer to the start address of the array, so y is not a variable at all, it is a reference! For every array a and integer j within the range of a, we have the following equivalences: a[j] j[a] It often surprises people to find that 3["abcde"] 'c', however we should never use these equivalences in production code. They are much too low-level and do not hold for higher-level containers such as the std::array and std::vector standard-library containers in C++. However, it's important that we fully understand why array variables are not variables in the normal sense. For any array a of type T, the equivalence at the machine-level can be expressed as follows: assert (a[j] == *(a + (j * sizeof (T)))); Given that a is a reference rather than a variable, the array subscript operator [] gives the programmer an intuitive and convenient means of performing pointer arithmetic upon that reference. Moreover, we can apply the exact same notation to pointer variables: T* p = &a; assert (p[j] == *(p + (j * sizeof (T))); Functions that operate upon arrays cannot differentiate between a fixed-length array and a variable-length array: void scale (int x[10], int scalar) { for (int i=0; i<10; ++i) x[i] *= scalar; } int y[5] {1, 2, 3, 4, 5}; scale (y, 2); // trouble awaits! Although the function appears to expect an array of exactly 10 elements, int[10] is not a type. The actual type is int* (a reference to the start address of the array), thus the compiler interprets the function as if it were actually written as follows: void scale (int* x, int scalar) { for (int i=0; i<10; ++i) x[i] *= scalar; } The function is hardwired with the magic number 10, but the function cannot know if x really refers to an array of 10 elements because all size information is lost. When we pass y to this function, the compiler will not complain, but y only has 5 elements, so there's a risk of overwriting memory that doesn't belong to our program. Technically, the function has undefined behaviour. To fix the problem we must pass the length of the array as well as the start address, and eliminate the magic number 10 entirely: void scale (int* x, size_t len, int scalar) { for (int i=0; i<len; ++i) x[i] *= scalar; } int y[5]; scale (y, 5, 2); // ok! Confusingly, although int[10] is not a type, int[][10] is treated as if it really were a type (one of the many inconsistencies in C). Thus the following is perfectly valid: void scale (int x[][10], size_t len, int scalar) { for (int i=0; i<len; ++i) for (int j=0; j<10; ++j) x[i][j] *= scalar; } In this example, x is a multi-dimensional array which decays to int** rather than int*. The additional level of indirection is necessary because every element in the array named x is of type int[10], which is yet another array (and therefore not a type!). As before, it's best to eliminate the magic number 10 entirely and pass the extra dimension through another argument. However, the compiler won't accept int x[][] as a valid type. The solution is to use the following form: void scale (int* x[], size_t len1, size_t len2, int scalar) { for (int i=0; i<len1; ++i) for (int j=0; j<len2; ++j) x[i][j] *= scalar; } The compiler will interpret this as if it were actually written: void scale (int** x, size_t len1, size_t len2, int scalar) { for (int i=0; i<len1; ++i) for (int j=0; j<len2; ++j) x[i][j] *= scalar; } The latter form is the preferred form as the indirection makes it much clearer how many dimensions we're actually dealing with. The variables len1 and len2 would normally be named rows and columns respectively, as we normally imagine a two-dimensional array as being a matrix or table of rows and columns. C uses row-major order, thus the first dimension always specifies the number of rows, and the second tells us how many elements of the given type (int) are in each row. Thus x[i] refers to the ith row of x, while x[i][j] refers to the jth element of the ith row of x (where i and j are both zero-based indices).
What are the codes for phoning mobiles in Eire?
If the mobile number is, for example, 0851234567 then do the following:Dial out of the UK: 00Dial into Rep. of Ireland: 353Dial the mobile number prefix: 85 (without the leading 0)Dial the remainder of the mobile number: 1234567All together this is:00 353 85 1234567Please note that the following may prevent you from calling the number:You may have call barring applied by your service providerThe number you are dialling may no longer be in service
What is the code if you are ringing from England to Ireland on a mobile?
Mobile numbers in the Republic of Ireland begin with 08, which becomes +353 8 in international format.Mobile numbers in Northern Ireland use the same codes as other UK mobiles, in the range +44 74 through +44 79.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
How do you put in a country code phone number?
If your cell phone allows you to enter a plus sign as part of the phone number, enter the country code with the plus sign, followed by the city code (in many, but not all, cases, you must drop the leading '0' from the domestic area code) and the number. For example, +12125550123 or +447700900123 or +35310123456
