Directions:Simplify the following monomials. 6.) 4ab + 13bc
7.) -5a²b² - a²b²
8.) 8x² - x² - 12x² + 2x²
9.) 16x²y - 4xy² - 5x²y + 10xy²
10.) Subtract -2x from -8x

ANYONE PLEASE HELP ME I REALLY NEED THE ANSWER RIGHT NOW BECAUSE I HAVE TO PASS THIS TOMORROW MORNING AT MY 1ST CLASS I HOPE Y'ALL CAN HELP ME:(
I'LL MARK YOU AS THE BRAINLIEST!​

20 only answer if 100% sure most high school-aged teens are very active. a. true b. false

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

Lee has $1.75 in dimes and nickels. the number of nickels is 11 more than the number of dimes. how many of each coin does he have?