What statement makes the open sentence true ? 49 - 7x = 21 a. x= 11 b. x=7 c. x=4 d. x=3

The answer is C. x=4

Explanation) 49 - 7 (4) = 21

7 (4) = 28

49 - 28 = 21

the answer to the question is a  

it has the same slope and the same y-intercept.

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.