Combine the like terms to create an equivalent expression 7k-k+19

Orly uses 2 cups of raisins for every 12 cups of trail mix she makes. how many cups of trail mix will she make if she uses 8 cups of raisins?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

The relative growth rate for a certain type of fungi is 60% per hour. a small culture has formed and in just 6 hours the count shows to be 20,273 fungi in the culture. what is the initial number of fungi in the culture?