4*n(n+1)
.....5 .....Σ 9r ...r=1
It is 751500.Here's the first ten.6, 12, 18, 24, 30, 36, 42, 48, 54, 60
1422, 1431, 1440
They are infinitely many and they form an increasing sequence the sum is infinite.
No. Odd numbers can be written as the sum of consecutive integers, but some multiples of odd numbers are even.
The sum of the first 10 multiples of 3 is 165.
The sum of the first 25 numbers is 25*26/2 = 325 So the sum of the first 25 multiples of 12 is 325*12 = 3900
Sum of the first 15 positive integers is 15*(15+1)/2 = 120 Sum of the first 15 multiples of 8 is 8*120 = 960
x = 22
The algebraic expression that represents the sum of 10 and 3 times a number x is 10 + 3x. This expression can be simplified by multiplying 3 with x to get 3x, and then adding 10 to it. In this expression, 3x represents three times the value of x, and 10 represents a constant value added to the product of 3 and x.
In a mathematical expression, a sum is typically represented by the addition operator, which is the plus sign (+). For instance, in the expression (a + b), the terms (a) and (b) are being added together, indicating that this part of the expression represents a sum. Any grouping of terms connected by the plus sign constitutes a sum.
90
975
75
5 + 10+15+20=50 ans
3(y+7)
" 3x + 5 " does.