What does counterexample mean

Kiera $25.62 in pennies, quarters, and nickels. She has 72 pennies, 73 quarters, and 28 dimes. How many nickels does Kiera have? A:52 B:77 C:116 D:427

Ambet has 2 quarters, 1 dime, and 3 pennies. How much money does amber have?

The average price of a circus ticket from 1970 to 2000 can be modeled by the equation y = 0.32x + 28, where y represents the average price, in dollars, and x represents the number of years since 1970. What does the slope represent?

Carlos biked 139/8 miles on Saturday and 135/7 miles on Sunday. On which day did he ride further and by how much?

What is between 68 2/3 and 72 1/2

Which of the following is a factor of 15x2-14x-8

Finley's pumpkin had a mass of 6.5 kilograms (kg) before he carved it. After carving it, the pumpkin had a mass of 3.9 kg. What was the percent decrease in the mass of the pumpkin?

Francesca is getting balloons for her father's birthday party. She wants each balloon string to be 9 feet long. At the party store, string is sold by the yard.

Integers and polynomials are both closed under _[blank 1]_. This statement means that if you _[blank 2]_ two integers or two polynomials, the result _[blank 3]_.

If y = 3 when x = 15, find the value of y when x = 75