Using Desmos or linear combination method on a scratch piece of paper, solve the system of equations below. State your answer in the form (x, y, z). In the area below prove mathematically this answer is correct. All steps need to be shown to earn full credit. x + 2y - 3z = -2 2x - 2y + z = 7 x + y + 2z = -4

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

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.

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1