Last year, hong opened an investment account with $6200 . at the end of the year, the amount in the account had decreased by 29.5% . how much is this decrease in dollars? how much money was in his account at the end of last year?

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

What is 20+(5 x 2/5 )+ 3 show your work

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882