The like terms are 3n and -n and the terms are 7 and 3
Answer:

Step-by-step explanation:
Given that the base area of the cuboid is 7cm² . And it's volume is 21cm³ . We need to find its total surface area . Now here we need to find the height . We can find height as ,
<u>Height</u><u> </u><u>:</u><u>-</u>
Let's find out the Total surface area .
<u>TSA </u><u>of </u><u>cuboid</u><u> </u><u>:</u><u>-</u><u> </u>
<u>Put </u><u>on</u><u> the</u><u> respective</u><u> values</u><u> </u><u>:</u><u>-</u><u> </u>

Answer:
10
Step-by-step explanation:
(1 1/4) * 8 = 10
Quick division: $420/5 days = $84/day