Algebra 1
Solving word problems
Pls answer fast thanks

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?