Sarah opens a savings account after her high school graduation. She opened her savings account with the $825 she received in gifts from her friends and
family. If at the end of 4 years, her account balance is $907.50, which best
describes the terms of this investment?
A-$825 invested at 2.5% compound interest
B-$825 invested at 2.5% simple interest
C-$825 invested at 3% compound interest
D-$825 invested at 3% simple interest

answer: the resulting cross section is a rectangle. solution: a plane parallel to the base of a triangular prism will intersect a cross section that is the same shape as its bases. so the cross section is a triangle.

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.