math check

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1.find the area heigh 5ft width 8 ft

A=H x W
A= 5ft x 8Ft
A= 40ft^2

2.The circular surface of a table has a diameter of 4 ft. What it will cost to have the top refinished if the company charges $5.00 per square foot for the refinishing ? Use 3.14 for pi and round your answer to the nearest cent.

(3.14)x(4/2)^2
(3.14)(2)^2
(6.28)^2=39.4384
39.4384 x $5.00
$197.19

3. Divid by moving the decimal point 27.3/10^5=
.000273

4. A beef roast weighing 6.6lb costs $2.25 per pound. What is the cost of the roast?

$2.25
x 6.6
$14.85

5. Write 0.00548 as a common fraction or mixed number.


548/100,000 = 137/25,000

2.The circular surface of a table has a diameter of 4 ft. What it will cost to have the top refinished if the company charges $5.00 per square foot for the refinishing ? Use 3.14 for pi and round your answer to the nearest cent.

(3.14)x(4/2)^2
(3.14)(2)^2 ok to here. For the next step you squared 3.14 x 2 but you should have squared just the 2.
3.14(2)2 = 3.14(4)=12.566 ft2. Then multiply by $5.00.

(6.28)^2=39.4384
39.4384 x $5.00
$197.19


Two notes:
1. Numbers 1, 3, and 4 look ok.
2. The 12.566 I have above should be 12.56 if we are using 3.14 for pi. I used pi from the calculator which uses 3.14159....

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