Ill give brainliest

solve this equation and find how many solutions is possible.

-2(x+3) = -2x - 6

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Empty box + box + empty box fill in the box is equal to 30 how