Need jimmy is trying to figure out how many pennies are in his bank. he asked his mother to him figure out the total. he tells her to let the amount in the bank equal 21x^3+18x^2+9x and each penny equal 3x. can you them figure out how many pennies are in the bank? a.7x^2+6x+3 b.21x^2+18x+9 c.7x^4+6x^3+3x d.21x^4+18x^3+9

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2