The area of the rectangle is 64.8 square centimeters. What is the perimeter of the rectangle? One group of ten tenths and one group of eight tenths divided into six groups of three tenths. Enter your answer in the box. centimeters

(a)

(b) 100

Step-by-step explanation:

Solving (a):

Given

Shape: Rectangle

Required

Calculate the perimeter.

Area is calculated as:

Where

and

Substitute 64.8 for Area

Make L the subject:

Perimeter is calculated as:

Substitute 64.8/W for L

To solve further, we take the derivative of P and set it to 0, afterwards.

Set to 0

Collect Like Terms

Cross Multiply:

Divide through by 2

Take square roots

Recall that:

So:

The perimeter is:

Solving (b):

Given

((1 Group of 10 tenths) and (1 group of 8 tenths))/(6 groups of 3 tenths)

Required

Solve

So, the expression becomes:

((1 Group of ) and (1 group of ))/(6 groups of )

This gives:

((1 Group of ) and (1 group of ))/(6 groups of )

Group means product, so the expression becomes:

And, as used here means addition

Simplify:

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step-by-step explanation: