Test: Mathematics Review Select the correct answer.
Sides of three square rooms measure 13 feet each, and sides of two square rooms measure 15 feet each. Which expression shows the total area
of these five rooms?
OA (3 x 13^2)+ (2 1542)
OB. (2 x 1343) + (2 x 15^2)
OC. (3 x 15^2)+(2 x 13^2)
OD. (3 x 13^2) * (2 x 15^2)
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The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.