The perimeter of a trapezoid is 39a-7. three sides have the following lengths: 9a, 5a-1, and 17a-6. what is the length of the fourth side

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.

Which diagram shows lines that must be parallel lines cut by transversal?

Simplify the expression below -3(10x+4y)+6(6x-2y)