The correct answer is D, 16 pages per minute. A unit rate is a ratio of something to one; in this case, the ratio is 16:1, or 16 pages to 1 minute. To get the unit rate for this problem, divide both numbers by 5 to get how many pages will be printed per 1 minute. 80/5 = 16, so the copier prints 16 pages in 1 minute. Answer choices A and B are not unit rates, and answer choice C is the incorrect unit rate.
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Replace X in the equation with the values in the table and calculate:
2X-5:
2(-4) -5 = -8 -5 = -13
2(-2)-5 = -4-5 = -9
2(1)-5 = 2-5 = -3
2(3)-5 = 6-5 = 1
2(5)-5 = 10-5 = 5
Length + width = 25cm
length = 25cm - width
length x width = 150 cm^2
(25cm-w)w= 150
25w-w^2=150
0=w^2-25w+150
0=(w-15)(w-10)
w=10cm
l=15cm
