Nine less than 4 times a number is the same as twice the number increased by 11. what is the unknown number?

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.

-2

7 - 9 = -2

reversed:

-2 + 9 = 7