Lisa drove 80 miles, then increased her speed by 10 miles per hour for 180 miles. If the second part of the drive took 2 hours longer than the first part, find her average speed.

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

Find the difference (8ab+a+2) - (3ab+6)

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3