Answer:I think that the answer is A
Step-by-step explanation:
You have a lot of questions here, I will help with the first three:
Factor:
4x^2 + 20x Factor out a 4x
4x(x + 5)
x^2 + 9x + 8 You have to work backwards with FOIL here
(x + 1)(x + 8)
Solve:
4r^2 - 16 = 84
4r^2 = 100
r^2 = 25
r = 5 or r = -5
Hey there! ☺


2/3 = x/15
(2) * (15) = x * (3) Cross Multiply
30 = 3x
3x = 30 Flip up the equation
3x/3 = 30/3
30/3 = 10 Simplify 30/3
x=10
Hope this helps!
20/15 simplified is:
how many times does 15 go into 20? 1
and how many leftovers are there? 5
so its 1 5/15
and you can simplify even more by 5 so it turns to 1 1/3
hope it helps :)