Strontium 90 is a radioactive material that decays according to the function A(t)=A_{0} e^{-0.0244 t},A(t)=A
0 e −0.0244t, where A_{0}A 0 is the initial amount present and A is the amount present at time t (in years). Assume that a scientist has a sample of 800 grams of strontium 90. What is the decay rate of strontium 90?

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

Sean is his dad build a tiled walkway in their backyard. the walkway will be 6060 feet long and 22 feet wide. the local hardware store sells tiles which are 22 by 22 feet and come in boxes of 66. how many boxes of tiles do they need?

Abank manager wants to encourage new customers to open accounts with principals of at least $2,500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?