What is the degree of polynomial 2x^7+4-5x^8-4x

The measurement of one angle of a right triangle is 34°. what is the measurement of the third angle?

What is the value of x in the diagram below?

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