Question

HELP!!!!! PLEASE!!!!!!! GIVING MEDALS!!!!!!!!!!
Luisa uses a certain type of computer paper
that is 0.097 mm thick. She wants to know how
many more pages she can print. Luisa measures
the stack of paper loaded in her printer to be
11 1/2 mm high and the stack of paper on her
bookshelf to be 23 mm high.
(a)
Calculate the total number of pages she can
print based on the heights of the two paper
stacks she measured and the thickness of
her paper.
(b)
How could Luisa estimate the number of
sheets of paper left by rounding? Is this
estimate an overestimate, underestimate, or
close estimate? Explain.

Answer 1

A. 1. Change the the 1/2 mm to a decimal. 1 divided by 2 = .5
2. Add the two stacks of paper. 11.5mm + 23mm = 34.5 mm
3. We want to know how many sheets of paper, .097mm thick, are in the 34.5mm stack of paper.
4. Since the sheet of paper is in mm and the stack of paper is in mm, we don't have to do any conversions.
5. So 34.5 mm divided by .097 mm is 355.67 sheets of paper. Clearly she doesn't have a .67mm sheet of paper. So we would have to round the answer to 355 sheets.

B. She could estimate the number of sheets by rounding the thickness of the sheet to .1mm and round the 11 1/2 mm stack to 12 mm. So 12mm +23 mm = 35mm. Divide 35mm by .01mm and you get 350 sheets. The estimate is pretty close to the actual value.

Answer 2

thank you!!!!