Triangle def is similar to triangle pqr. side de measures 3, side ef measures 7 and side fd measures 9. side pq measures 5x – 25 and side qr measures 6x + 4. find the value of x

For this problem, we can set up a proportion using similarity ratios. We know that triangle DEF is similar to triangle PQR, so we know that DE/PQ = EF/QR = FD/RP:

DE/PQ = EF/QR

3/(5x - 25) = 7/(6x + 4)

Cross multiplying, we get:

7(5x - 25) = 3(6x + 4)

35x - 175 = 18x + 12

Now, we can solve for x:

35x - 18x = 12 + 175

17x = 187

x = 11

So, x is 11.