How do you find how many solutions a system of equations has?

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

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

Agrasshopper weighs 0.89 grams. express the grasshopper’s weight in scientific notation.