There's 30 cows in a field, 20 ate chickens, how many didn't? :)

If 20% of a number is 35, what is 50% of that number?

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.