<span>f(x) = ax2+bx+c, is quadratic equation
</span><span>function opening downward if the a<0,
</span><span>kf(x) = -x², a= -1<0
so the answer is </span><span>B.kf(x) </span><span>
</span>
f(x) = 8x-9
f(4)
let x=4 and substitute in
f(4) = 8*4 -9
f(4) = 32-9
f(4) = 23
2 represents area Becuase of the area formula
Answer:
The answer is C.
Step-by-step explanation:
2x+1+x+4
3x+5
1/2x(6x9x1)+15
1/2x(6x9)+15
1/2x54+15
27+15
42
