Hello there!
8m² - 4(7m³ + 5n²)
You wanna start by using the distributive property
=8n² - (-4)(7m³) + (-4)(5n²)
= 8n² - 28m³ - 20n²
= -28m³ - 12m²
D it's store d, it's the cheapest
Area =

where p and q are it's diagonal
so according to the rule.



is the answer.
<em><u>hope </u></em><em><u>understands </u></em>