Why does gcd not change when with multiples of numbers?

100pts: Prove or disprove: If x is a 2 digit number, and y is the number formed by reversing the order of X's digits, then x + y = 11 (x+y). For example, if x is 54 then y is 45. I give brainliest!

The basic sticker price on Mr. Feldman's new car was $3200, The options he desired cost an additional $1800. What percent of the total price was made up options?

What is 12 / 2/3? nothing pops up when i search it and i have a module exam!

How do i put f (x) = - x^2 + 8x + 9 in vertex form?

Y=3x means vertical stretch by a factor of

Alaina sugar cookie recipe calls for 2 1/4 cups of flour per batch if she wants to make 2 / 3 a batch of cookies how much flour should she use

Evaluate e-1/2f when e=15 and f=12

Sort data from least to greatest 0, 0, 1/2, 1, 1, 5/4, 1/4, 2, 1, 2, 1/2

Catherine is considering two new cell phone plans. She doesn't want to spend more for minutes she won't use. One plan allows up to 250 minutes per month for $49, and the other plan allows up to 350 minutes per month for $65.

What is the value of the variable that makes the statement true? a + (-7) + 3=0 A. - 4 B.-3 C. 4 D. 7