since ΔQRS similar to ΔQRP, then
SR/QR = QR/PR
x/12 = 12/(3.5+x)
x(3.5+x) = 12²
x² + 3.5x = 144
x² + 3.5x - 144 = 0

approximately 10.38
Answer:
21
Step-by-step explanation:
x+42=3x
-x -x
42=2x
÷2 ÷2
x=21
You need to know mass and speed
1. rate of change of position this is measured in m/s
2. direction in change of position.
Answer:
4x-20
Step-by-step explanation:
2x + 2x =4x
10 + (-30) = -20
put it together!
4x-20
(i hope thats the answer form u were asking for) xoxo raina