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How do you find the sum of 1 plus 2 plus 3 plus 4 plus . plus 79?
Sum = 79*(79+1)/2 = 79*80/2 = 3160
What sums equal 80?
There are infinitely many. Involving integers (whole numbers) there are: 0 + 80, 1 + 79, 2 + 78, .... 78 + 2, 79 + 1, 80 + 0, 81 + -1, 82 + -2, ..... When you include non-integers there are: ½ + 79½, 1½ + 78½, ... 1.1 + 78.9, 1.2 + 78.8, .... 3.1 + 76.9, 3.14 + 76.86, 3.141 + 76.859, 3.1415 + 76.8585, 3.14159 + 76.85841, ...., π + (80 - π)
What two numbers multiply to -80 and add up to 79?
-1
What set of numbers has a mean of 80?
There are an infinite number of sets with mean 80. Here are some: {80, 80, 80}, {80, 80, 80, 80, 80, 80} {79, 80, 81}, {79, 79, 80, 81, 81}, {79, 79, 80, 82} (1, 80, 159}, {-40, 200} To produce a set of n numbers with mean 80, start with any set of n-1 numbers. Suppose their sum is S. Then add the number 80*n-S to the set. You will now have n numbers whose sum is S+80*n-S = 80*n So the mean of this set is 80.
What plus what will equal 78?
77+1 = 78 is one such example
What is 78 plus 1?
78 + 1 = 79
What is 1 plus 79?
80
How do you find the sum of 1 plus 2 plus 3 plus 4 plus . plus 79?
Sum = 79*(79+1)/2 = 79*80/2 = 3160
What is the answer to the equation 5x plus 2x-78 equals 1?
10x - 78 = 1, 10x = 79, x = 7.9
What sums equal 80?
There are infinitely many. Involving integers (whole numbers) there are: 0 + 80, 1 + 79, 2 + 78, .... 78 + 2, 79 + 1, 80 + 0, 81 + -1, 82 + -2, ..... When you include non-integers there are: ½ + 79½, 1½ + 78½, ... 1.1 + 78.9, 1.2 + 78.8, .... 3.1 + 76.9, 3.14 + 76.86, 3.141 + 76.859, 3.1415 + 76.8585, 3.14159 + 76.85841, ...., π + (80 - π)
What is the range of 79 and -1?
80
What is 78 add 1?
79
How much can 2 go into 79?
40 x 2 = 80 39 x 2 = 78 39 times with 1 remaining
How many tens are in 79?
1
What 2 number you can mutiply to 80 but subtract to get -79?
mn = 80 m -n = -79 Substitute m - 80/m = -79 m^2 - 80 = -79m m^2 + 79m = 80 (NB Notice change of signs) Quadratic Eq'n m = { - 79 +/- sqrt[)79)^2 - 4(1)(-80)}] / 2(1) m = { - 79 +/- sqrt[6241 + 320}]/ 2 m = { -79 +/- sqrt[6561]} / 2 m = { - 79 +/- 81}/2 m = -160 / 2 = -80 or m = 2/2 = 1 Hence n = 1 + 79 = 80
What Is 1+79?
The Anwser Is 80.
What plus what equals 79?
There are an infinite amount of answers for that, such as: 1 + 78 2.5 + 76.5 38 + 41
