What is 2 x -4? (im so confused hellppp)

Average salary for a medical assistant is $31,220 which is a 20% income tax bracket how much money would they pay in income tax?

Which sentence uses an objective tone? we will plant the best garden of any school in the area. the new campus garden will surely be envied by other schools. a garden would provide numerous benefits to the students. you will probably agree that gardens have many benefits.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16