Step-by-step explanation:
15a)
Subtract both sides by 21

15b)
7 and -3 multiply to -21 and add to 4
The factors are (x+7)(x-3)
15c)
x+7 =0
x=-7
x-3=0
x=3
Answer:
Bro XD lol just simplify it.
the answer is 3
Ain’t really sure but I’m it’s ( C
Answer:
B. x = -4
E. x = 10
Step-by-step explanation:

Answer:
Logarithm base is 2
Step-by-step explanation: