Question

In which of the expressions below will x = 2.5? Select all that apply. A) 10x+209=5 B) 10x–12=38 C) 9x+18=45 D) 6x=15 E) 12x–4=26

Answer 1

The values of x that satisfy the expression x = 2.5 are D. 6x = 15 and E. 12x - 4 = 26 which are both equal to 2.5

To determine each expression for x and see if x equals 2.5:

A)10x + 209 = 5

10x = 5 - 209

10x = - 204

x = - 20.4

(x ≠ 2.5)

B)10x - 12 = 38

10x = 38 + 12

10x = 50

x = 5

(x ≠ 2.5)

C) 9x + 18 = 45

9x = 45 - 18

9x = 27

x = 3

(x ≠ 2.5)

D)6x = 15

x = 15/6

x = 2.5

(x = 2.5)

E) 12x - 4 = 26

= 26 + 4

12x = 26 + 4

12x = 30

x = 30/12

x = 2.5

(x = 2.5)

So, expressions D and E have x equal to 2.5