Simplify: xy^2(-2x)(3xy)(-4x^2y)1/8x^2y^3

Olive's solar powered scooter travels at a rate of 30 miles per hour. what equation can she use to calculate her distance with relation to the time she traveled? h=hours m=miles 1. h=m+30 2. m=30h 3. m=h+30 4. h=30m

Can someone me with my math problems i have a bunch. i will give brainliest and lots of pleeeaaasssee

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?