The total cost c for p pounds of lithium if each pound costs $5.57

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

Three times the sum of a number and seven is negative thirty-six. what is the number?

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25