If triangle rst is an acute triangle, then m∠s must be

less than 90°.
equal to 90°.
equal to 100°.
greater than 90° and less than 180°.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.

Abag contains 10 white golf balls and 6 striped golf balls. a golfer wants to add 112 golf balls to the bag. he wants the ratio of white to striped gold balls to remain the same. how many of each should he add?