Question

Pls help i'm dead if i get this wrong.

Answer 1

41.59

Explanation:

The equation given is SA= 2(lw)+2(wh)+2(lh)

What you should do in this case is input all the values first. So you should have:

SA= 2(2.1*1.45)+ 2(1.45*5)+ 2(2.1*5)

SA=6.09+14.5+21

SA= 41.59

Answer 2

41.59 square meters

Explanation:

You want the surface area of a rectangular prism with dimensions ...

• L = 2.1 m
• W = 1.45 m
• H = 5 m

You are given the formula ...

SA = 2LW +2WH +2LH

Area

You find the area by replacing the variables in the formula with the given values, then doing the arithmetic.

We find there is less typing involved and fewer calculator operations if we rearrange the formula first. We can factor some terms, so we have ...

SA = 2(LW +WH +LH) . . . . factor out 2

SA = 2(LW +H(L +W)) . . . . . factor H from the last two terms

The attached calculator screen shows the use of this formula with the given numbers.

SA = 2(2.1·1.45 +5(2.1 +1.45)) = 41.59 . . . . square meters

The surface area is 41.59 m².