It looks like 19 would be.
I don't know any slick way to find it, other than just slugging it out.
Answer:
(C - B)/A = x
Step-by-step explanation:
Ax + B = C
-B -B
Ax = C - B
Divide both sides by A
x = (C - B)/A
(C - B)/A = x
Answer:
The first number is 10, and the second is 40.
Step-by-step explanation:
X is equivalent to 10, and the equation for this question is x + 4x = 50. Therefore, 5x = 50. If you divide both sides by 5, you get x = 10. This means the first number is 10, and since the second is 4 times that, 4*10 = 40. 40 + 10 = 50, to check.
The formula for the sum of n terms in an arithmetic progression is:
S = n/2 * (2a + (n-1)d)
Here, the common difference, d, is 8 and the first term, a, is 1. Substituting these into the formula, we get:
S = n/2 * (2*1 + 8(n - 1))
S = n + 4n² - 4n
S = 4n² - 3n
The answer is A.
