I am trying to do integers but I missed most of it when we we´re learning about it I was mentally sick what do you do with integers? my first problem is this -7x-4=+

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?

Someone me! if you’re smart you can solve this!

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points