Several students are cleaning cars. they charge $4 for washing and $4 for vacuuming. both forms of cleaning take the same amount of time. they have time to clean 20 cars. they want to raise a total of $80. how many of each types of cleaning should they do? make a system of equations to show the problem. then solve the problem visually or by making a graph.

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5