Question

Andy incorrectly solved an equation and showed his work.

step 1: 5 (2r + 5) = 100
Step 2: 10x + 5 = 100
Step 3: 10x = 95
Step 4: x = 9.5

What error did Andy make, and what is the correct solution to his problem?

a: Andy made an error with the distributive property in step 2, x = 7.5

b: Andy made an error with the distributive property in step 2, x= 12.5

c: Andy made an error with the associative property in step 2, x= 7.5

d: Andy made an error with the subtraction property in step 2, x= 12.5​

Answer 1

the answer is A. this is because when andy distributed the 5 from the outside of the parenthesis to the inside, he multiplied 5•5 to equal 10, and 5•5 is 25.