75% a)
What percentage of this grid is shaded?
9/20
b)
How many more squares need to be shaded
so that 70% of the grid is shaded?

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

m=-16

step-by-step explanation:

i'm a sophomore in connections, i'd recommend checking on jishka.com they have a large range of questions and answers from our school.