Find a measure of the indicated and go to the nearest degree

Help please !! ASAP

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122