At a Mexican Restaurant, 2 plates of tacos & 1 cheese dip cost $18.50. 3 plates of tacos & 2 chees dips cost $29.50. Set up a system of equations and solve to find the cost of the plate of tacos.
A) $3.50
B) $18.50
C) $10.00
D) $7.50

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Which of the following circles have their centers on the x-axis? check all that apply.