Cary collected a total of 400 pennies and dimes. 80% of them
are pennies. After donating some pennies, 50% of the
remaining coins were pennies. How many pennies did Cary
donate?
pennies

Its due ! write an equation in which the quadratic expression 2x^2-2x 12 equals 0. show the expression in factored form and explain what your solutions mean for the equation. show your work.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.