How many liters each of a 25% acid solution and a 70% acid solution must be used to produce 90 liters of a 40% acid solution?

What is 20+(5 x 2/5 )+ 3 show your work

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 i need !

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14