Answer:

Step-by-step explanation:
-The total volume will be the sum of the volumes of the triangular section plus the rectangular section.
#Volume triangular section:

#Volume rectangular section:

#Total volume of the doorstep:

Hence, the doorstep's volume is 
Answer:
A = $13,660.81
Step-by-step explanation:
P (principal) = $4,800.00
I (interest) = $8,860.81
First, convert R as a percent to r as a decimal
r = R/100
r = 6.2/100
r = 0.062 rate per year,
Then solve the equation for A
A = P(1 + r/n)nt
A = 4,800.00(1 + 0.062/4)(4)(17)
A = 4,800.00(1 + 0.0155)(68)
A = $13,660.81
I'm really not good at this .. but if u want multiply or dived the cm's .. math is not my best subject if I'm wrong .. sorry
9, I believe.
4(2)+2(1)^2-(1)^3 (^ just means to the power of "exponent")
8+2-1=9