Solve the system of equations using elimination/combinations

-2x-y=-4

x+2y=5

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?