Answer:
Step-by-step explanation:
This is asking what is A
Formula A squared + B squared = C squared
A=x
B=8
C=20
X^2+ 8^2=20^2
8 squared is 64
20 squared is 400
400-64 is 336
X*X=336 find the square root of 336 =18.3
CHECK
18.3*18.3+ 8*8=398.89 which is super close to 400
Answer:
8x + 4
Step-by-step explanation:
change it around
9-5 5x+3x.
9-5=4, 5x+3x=8x.
4+8x or 8x+4
Answer:

Step-by-step explanation:
Distributive Property: 
Write An Equation:
(5 * x) + (5 * 3)
Solve:
5 * x = 5x
5 * 3 = 15
Rewrite Equation
5x + 15