Find the surface area of the right cylinder which has a diameter of 16 and height of 4

603.16

Step-by-step explanation:

Notice that the surface of a right cylinder can be formed by a rectangle that is rolled to conform a tube, and two circles (one for the top and one for the bottom). So in order to estimate its surface we need to add these.

Recall that the area of a circle of radius "r" is: , therefore considering that the diameter of the cylinder is 16, its radius must be 8, and this formula gives:

Now for the rectangle: the base of it is equal to the actual length of the circumference of its base, so the length of its base is:

and the rectangle's height is: 4

Then the rectangle's area is: 4 * 50.26 = 201.04

So now we add the two circles plus the rectangle and get:

2* 201.06 + 201.04 = 603.16

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step-by-step explanation:

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.