Which represents a function? A {(-2, 1). (0, 2), (1,3), (1.4)}

B {(-1,5),(-1,6). (1,5), (1.6)}

C
{(3, 1). (3. 4). (3.5), (3,9)}

D{(4.8). (5. 1). (7.3).(8.6)}

Need Help ASAP

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.