Which pairs of lines are perpendicular? y=3x-5y=3x−5 and y=3x+4y=3x+4

y=3x-5y=3x−5 and y=1/3x-5y=1/3x−5

y=3x-5y=3x−5 and y=-1/3x-5y=−1/3x−5

y=3x-5y=3x−5 and y=-3x-5y=−3x−5

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.