Question

Select each expression that has a value of 15 when x = 15.A.+ 103UB. 15,521 = xC. (3,015 + x) – 186D. 20x2 = 30E.2.225- 25

Answer 1

from the calculations above, only option A and C are correct

Explanation:

Answer 2

hello

to solve this question, we need to pick each option and simplify it and see if the answer corresponds

a

`\begin{gathered} a.\text{ }(x)/(3)+10 \\ x=15 \\ a=(15)/(3)+10=5+10=15 \end{gathered}`

option A is correct, let's test for option b

`\begin{gathered} b \\ (15521)/(x) \\ x=15 \\ (15521)/(15)=1034.73 \end{gathered}`

option b does not corresponds to 15 hence it's a wrong option.

let's move to option c

`\begin{gathered} ((3015)/(x))-186 \\ x=15 \\ (3015)/(15)-186=201-186=15 \end{gathered}`

option C is correct since the value of the expression is equal to 15

let's check for option D

`\begin{gathered} (20x^2)/(30) \\ x=15 \\ (20(15)^2)/(30)=(20*225)/(30)=(6750)/(30)=225 \end{gathered}`

option D does not corresponds to 15 and it's a wrong option

let's check for option E

`\begin{gathered} (2x^2)/(5)-25 \\ x=15 \\ (2*15^2)/(5)-25=(2*225)/(5)-25=90-25=65 \end{gathered}`

option E is also incorrect

from the calculations above, only option A and C are correct