4. -171 +1 -181 - 30 5. 4 (-1)(-4)
6. -15(5)
7. -72 = (-4)
8. 210 • (-7).

First person to get all will be marked brainiest :]

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

In a rectangle klmn, km = 6x + 16 and ln = 49. find the value of x