5x + 2 + x

simplify each expression using the properties of numbers

What are the coordinates of the image of p for a dilation with center (0, 0) and scale factor 2

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters

Iknow the answer but the calculator doesn't seem to give the right one