What is the probability that at least two coins will be tails?

A.1/8

B.3/8

C.1/2

D.3/4

Solve: 3x+y=6 4x-2y=18 show all work !

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.

Which is the focus of a parabola with equation y2=4x