Answer:
12 feet
Step-by-step explanation:
Area of a Rectangle: l × w
84 ft² = l × 7 ft
Length = 84 ft² ÷ 7 ft = 12 feet
Hope this helps.
the answer is a
you can subsitute or work backwards
Function
d. 4f(t)
=4(t²+9)
=4t²+36
e. (f(t))²+8
=(t²+9)² + 8
= t⁴+18t²+81+8
= t⁴+18t²+89
