Yeah 420 i think hope this helps
Answer:


Step-by-step explanation:
Given


Required
Solve by elimination
To do this, we subtract both equations (to eliminate x)

- 
--------------------


Substitute
in 

Solve for 3x

Solve for x


Answer:
4s
Step-by-step explanation:
You can just pretend it's like normal addition and subtraction but with s, so you do -2s - 4s + 10s = -6s + 10s = 4s.
Answer:
40
Step-by-step explanation:
DeltaMath
r to the 4th power = r⁴
t to the third power = t³
r to the 4th power times t to the third power would be written as:
(r⁴)(t³)