Aaron has 50cent. he buys a pencil for 40cent how much change does he get​

Which of the following is true for the relation f(x)=2x^2+1

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?

Bring the fraction a/a-4 to a denominator of 16-a^2