Astudent measured a books cover and recorded the length as 28.1 cm and the width as 22.7 cm.

P= (Lx2)+(Wx2)

A=Bxh

Explanation:depends if you are finding area or perimeter. Area is base multiply by height (or length times width).

Perimeter is base times 2 plus width times 2 (or add all the sides up)

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.