Alandscaper had 5 tons of rock to build decorative walls. he used 1/4 ton of rock for each wall. how many decorative walls did he build?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

Organic apples are on special for $1.50 per pound. does total cost vary inversely or directly with the number of pounds purchased? find the cost of 3.4 pounds of apples. a. inversely: $5.10 b. directly; $5.10 c. inversely: $2.27 d. directly; $2.27

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