What is the volume of a sphere with a radius of 1/2 using 22/7 as pi.

Is the power produced directly proportional to the wind speed, give reasons for your answer?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18