Which sentence does not belong with the other 3?
a.) x + 12 = 12 + x
b.) 7h = h ∙ 7
c.)1 + a = a + 1
d.) n ÷ 2 = 2 ÷ n

What percent of the circle below is shaded?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.

There are a total of 75 students in the robotics club and the science club. the science club has 11 more students than the robotics club. how many students are in the science club?