Question

4. Mary is reviewing her algebra quiz. She has determined that one of her solutions is incorrect. Which one is it? A. 2x + 5 (x-1) 9, X 2 B. p - 3(p-5) 10, p 2.5 C. 4 y +3 y 28, y 4 E. t - 2t - 3t 32, t 8

Answer 1

Answer:

E. t - 2t - 3t =32, t=8

Step-by-step explanation:

A. 2x + 5 (x-1)= 9, X= 2 it's ok because

$2x+5(x-1)=9\\ 2x+5x-5=9\\ 7x=14\\ x=2$

B. p - 3(p-5)= 10, p= 2.5 it's ok as well because

$p-3(p-5)=10\\ p-3p+15=10\\ -2p=-5\\ p=\frac{-5}{-2} \\ p=2.5$

C. 4 y +3 y=28, y=4 also it's ok because

$4y+3y=28\\ 7y=28\\ y=\frac{28}{7} \\ y=4$

E. t - 2t - 3t =32, t=8 it's not ok because

$t-2t-3t=32\\-4t=32\\t=\frac{32}{-4} \\t=-8$

a (-) is missing!