Write the expression as a polynomial in standard form

5x+4x^2(2x+7)-6x^2-9x

Seattle, washington is known for being rainy. one day last month, 8 inches of rain fell in 1 1/2 hours. what us the rate of the rainfall expressed in ft per plzzz write a proportion i will give you 100 points

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

32a³b² 8ab² simplify the following expression.