Calvin bought 2 t-shirts for $50, and Bradley bought 4 t-shirts for $90. Did they pay the same rate? Explain your reasoning.

Julia chooses a card at random from her set of cards. what is the probability that the card is labeled cat or hamster?

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?