A chemist mixes 12 liters of a solution that is 45% acid with 8 liters of a solution that is 70% acid. What is the percent of acid of the mixture? Help please

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)