Sarah worked 8 more hours than Heidi. Write an expression that represents the number of
hours each student works in term of Sarah.

Which keywords are essential to write an
expression?

How many operations are needed for this expression?

Which variable should I use?

Heidi worked 20 hours how many hours did Sarah?

both graphs increase on their domain

neither graph has a y-intercept

step-by-step explanation:

the following points can be visualized easily from the graph

hope this is what you were asking for!

step-by-step explanation:

probably the last option

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.