Using this equation "7b+4+3X-6+12b= 50" answer the following question

Atrucker had a load of grain containing 2 tons. she unloaded 1 ton and 1,200 pounds at the warehouse. how much grain does she still have left on the truck?

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6