Nick has two cans of white paint, one with a 2% yellow pigment and the other with a 5% yellow pigment. he wants to mix the two paints to get paint with a 4% yellow pigment. how much of the 5% yellow pigment paint should be mixed with 0.4 gallon of the 2% yellow pigment paint to get the desired paint?

Equation:
yellow + yellow = yellow
0.05x + 0.02*0.4 = 0.04(x+0.4)

Multiply thru by 100 to get:
5x + 2*0.4 = 4x+4*0.4
x = 2*0.4
x = 0.8 gallons (amt. of 5% paint needed in the mixture)

 Hope that helped :)

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)