Triangle PQR is an isosceles triangle. 72
(3x + 9)
P
R
What is the value of ?
A 9
C 21
B 15
D 33
Hurry please I need help

Agrocery store has 12 lb of trail mix that is 10% banana chips. the store's manager would like to add banana chips to bring the new mix up to 25% banana chips. write and solve a system of equations to find out how many pounds of banana chips manager needs to add.

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?