9. In the year 2000, Kevin and Keith each received $5,000. Kevin decided to put his $5,000 in his house safe and each year add $500 to his money stash. Keith decided to
invest his $5,000 in computer stock. The value of Keith's stock climbed according to a
parabolic curve until it peaked at $17,500 in 2010. By 2014, the stocks had fallen to a
value of $15,500. Formulate a system of equations to determine the number of years
it would take for the amount Kevin has in his money stash to be equal to the value of
Keith's computer stock.

good luck on ur quiz test or homework. have a good day : )

parallel lines have the same slope. so if the green line has a slope of -4, the slope of the red line is also -4.

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.

triangle eg 7.5 × cos "a" or 7.5 × sin "b" or 6 tan"a"