Let a =9, b=2,c=5,d=3 1.4 abc / d^2 =
2.a+c^2 /(b+d)^2 +a=
3.a(b+cd)=
3.a^2(c-d)^2=
4.2(d+bc)/b^3+c=
5.b(a-c)^2=
6.b^2c^2d^2/a+1=
7.(a+b)(c-d)=
8.(4a-5b)^2=
9.c(a^2+4)=
10.2ab^2-cd=

what i would say the best answer is a. 40.5

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)

the answer is  

c.

90.0π cm^2

hope you got it.