Solve this problem using estimation.
melissa bought 18 cupcakes and 2 gallons of fruit punch for her valentine party. if the cupcakes cost $.28 each and the punch costs $2.78 a gallon, estimate her total bill.

Which problem could be  solved  by evaluating the expression  7×(−3)7×-3?

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?