Find the value of x.

7

Step-by-step explanation:

this is an isosceles triangle so you know the two longer sides must be equal.

2x-7=7

2x=14

x=7

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.

if x decreases by 4 then y increases by 10

step-by-step explanation: