Find the vertex of a function f (x) = - 3x^2+9x-15 by completing the square

The length of a rectangle is increasing at a rate of 3 cm/s and its width is increasing at a rate of 8 cm/s. When the length is 15 cm and the width is 6 cm, how fast is the area of the rectangle increasing?

What is 50779 divided by 590, need the problem worked out

A stack of blocks is 15.2 inches tall. if there are 10 blocks stacked one on top of each other how tall is each block?

Suppose a triangle has two sides of length 42 and 35, and that the angle between these two sides is 120 degrees. What is the length of the third side of the triangle?

You and a friend are selling lemonade. You sell three times as many cups as your friend. What percent of the cups sold were sold by your friend? Explain.

You have enough wallpaper to cover 240 square feet. If your walls are 8 feet high, what wall length can you paper?

How to solve 29+d=54; 24,25,26

Alisa had 1/2 a liter of juice in a bottle. She drank 3/4 of the juice that was in the bottle. How many liters of juice did she drink?

An animal shelter spends $5.50 per day to care for each bird and $7.00 per day to care for each cat. Gianna noticed that the shelter spent $217.00 caring for birds and cats on Friday.

Find the following product 4x+5 (4x-5)