I love measurements, but I really didn't have time to do these until now, 3 hours before the class.

If anybody is interesting in this feild, please help me, and I'd really really be GRATEFUL

1- The avarage density of Styrofoam is 1.00 kg/$\displaystyle m^3$. If a Styrofoam cooler is made with outside dimensions of 20.0 * 14.0 * 12.0 inches and the uniform thikcness of the Styrofoam is 1.50 inches ( including the lid ), what is the volume of the Styrofoam used in cubic meters? What is the mas in kilograms? How many gallons of liquid could be stored in the cooler?

2- A pressure gauge on an air tank reads 210 pounds per square inch (psi). The face on the gauge says +_ 3% at 180 psi.

a) What is the range of air pressure in the tank when the gauge reads 210 psi ?

b) What is it when the gauge reads 87 psi ?

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- this star * in the first problem means " multiply by"

- +_ , these two signs are supposed to be over each other but i don't know how to do it.

and the book answers to the problems are :

1 - volume = 2.75 * $\displaystyle 10^-2$ $\displaystyle m^3$

Mass = 2.75 * $\displaystyle 10^-2$ kg

# gal = 7.29 gal

2 -

a) 205-215 lb/$\displaystyle in^2$

b) 82-92 lb/$\displaystyle in^2$

$\displaystyle 10^-2$ is 10 to the power -2

Thanks in advanced