Find cos A if a= 16, c= 20

4+6x-3x^3 in standard form with explanations because i don’t understand

Zoe placed colored blocks on a scale in science class. each block weighed 0.8 ounces. the total weight of all the colored blocks was 12.8 ounces. how many blocks did zoe place on the scale? write and solve an equation to find the answer.

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?