you are playing a board game that uses an hourglass timer filled with sand. the percent y of sand remaining in the timer after x miinutes is y=-0.25x+1. After how many minutes is the timer 25% full?

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

the answer is a

step-by-step explanation:

b

step-by-step explanation:

the word superfluous means unnecessary

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.