Which types of reasons are not valid in a mathematical proof?

A. unproven theorems

B. postulates

C. definitions

D. already-proven theorems

the rates of currency exchange published in the newspapers on a certain day showed that €14 could be exchanged for J$4200. how many dollars could be obtained for €112

How many ounces are in a quart

How many times did the team score 6 runs? Line plots and Histogram

In three more years, Angelo's grandfather will be six times as old as Angelo was last year. When Angelo's present age is added to his grandfather's present age, the total is 68. How old is each person now?

What value of y will make this expression equal to 2.45? A. There is no value that will make the expression equal to 2.45. B. The expression will equal 2.45 when y=-4.9. C. Any value of y, except when y=-4.9, will make the expression equal to 2.45.

3x+5-x=2x+7 is infinite real soluction, no real soluction or one real soluction

Select the correct answer. Which of these statements explains the term price? A. the money spent by a seller to advertise a product B. the money spent by a manufacturer to make a product C. the money spent by a buyer to purchase a product

A polling organization took a random sample of 3,000 middle school students to determine how many have a dog. Suppose that 57% of all middle school students have a dog.

When Sally went bowling, her scores were 108, 72, and 95. If she bowls a 4th game, what will her score need to be to give her an average of 91?

Tanya kicks a ball into the air. The function that models this scenario is f (t) = - 16t2 + 96t, where h is the height of the ball in feet and t is the time seconds. When will the ball hit the ground?