Answer:
30
Step-by-step explanation:
62 = 2x+2
62-2 = 60
60/2 = 30
Answer: f(g(x))= -2x+43
Step-by-step explanation:
Here, you would start by substituting the equation for g(x) into the x value of f(x) equation.
Since g(x)=1/4x+5, f(g(x)) would be:
f(g(x))= 3-8(1/4x+5)
Then you would simplify.
f(g(x))= 3-8(1/4x+5)
= 3-2x+40
=-2x+43
Start with the x intercepts.
You need to factor the original function.
y = x^2 - 4x - 21
y = (x - 7)*(x + 3) These are the correct factors.
The two roots are
x = 7
x = - 3
So the two points you want are (7,0) and (-3,0)
That makes the answer C <<<<========
The vertex is a little harder. You need to complete the square to get it. (I take it you don't know any calculus yet.
y = x^2 - 4x - 21
y = (x^2 - 4x + ... ) - 21
y = (x^2 - 4x + 4) - 21 - 4
y = (x - 2)^2 - 25
The vertex is (2,- 25)
The answer is B <<<<<<=======
The answer is 18.5, I believe
good luck
It would go over the five, so im guessing the hundreds