A computer printer can print 10pages per minute. There were already 35 pages in the tray. The total pages printed was 115pages. How many minutes has the printer been running?

8minutes

Step-by-step explanation:

Total pages printed = 115pages

Since there are 35pages already on the tray before the printing commences, the additional number of pages printed will be 115-35 = 80pages

If 10pages is printed in one minute, 80 pages will be printed in (80/10)minutes which is 8minutes.

This means that the printer has been running 8minuutes.

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb