Nicky’s classroom is in the shape of a rectangle. his teacher wants to add a border around the walls. the length of the room is 22 feet and the width of the room is 15 feet. how long must the border be to go all the way around all four walls of the room?

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.

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?

Ron has 8 caps and 4 of his caps are blue. thes rest of his cap are red. how many of ron's caps are red