Awood board is one of a 6 different parts in a shelf kit. the width, depth, and height dimensions of the board are 42 inches x 8 inches x .75 inches, respectively. the board is made from southern yellow pine, which has an air dry weight density of .021 lbs/in.3. (watch the units of measure)

The complete question is
A wood board is one of a 6 different parts in a shelf kit. the width, depth, and height dimensions of the board are 42 inches x 8 inches x .75 inches, respectively. the board is made from southern yellow pine, which has an air dry weight density of .021 lbs/in.3. (watch the units of measure)
1) What is the volume of the wood board? Precision = 0.00
2) What is the surface area of the wood board? Precision = 0.00
3)What is the weight of the wood board? Precision = 0.00
4) If one gallon of paint will cover 35,000 square inches, how many gallons would be needed to give two coats of paint to 15,000 boards? Round your answer to the nearest gallon

Part 1) What is the volume of the wood board? Precision = 0.00
we know that
volume=L*W*H> 42*8*0.75> 252 in³

the answer Part 1) is 252 in³

Part 2) What is the surface area of the wood board? Precision = 0.00

surface area=2*area of the base+perimeter of the base*height

area of the base=42*8> 336 in²
perimeter of the base=2*[42+8]> 100 in
height=0.75 in

surface area=2*336+100*0.75> 672+75> 747 in²

the answer Part 2) is 747 in²

Part 3)What is the weight of the wood board? Precision = 0.00

we know that
density=mass/volume> mass=density*volume
density=0.021 lbs/in³
volume=252 in³
mass=0.021*252> 5.292 lbs

the answer Part 3) is 5.29 lbs

Part 4) If one gallon of paint will cover 35,000 square inches, how many gallons would be needed to give two coats of paint to 15,000 boards? Round your answer to the nearest gallon

if 1 gallons cover> 35000 in²
x > 747 in² (one board)
x=747/35000> x=0.021 gallons per 1 board
so
15000*0.021> 320.14 gallons
but remember > two coats of paint
so
320.14*2> 640.28 gallons> 640 gallons

the answer Part 4) is 640 gallons