Hurryyy 20 pts mrs. nygaard needs 12 hours to grade all of her students’ projects. she made a chart to show how much time she could spend grading the projects during the week. how many hours will mrs. nygaard need to work over the weekend to finish grading the projects?

Add all the hours together:

1 3/4 + 1 1/4 = 3 + 1 1/2  = 4 1/2 + 1 1/5

To add fractions with different denominators, find the common denominator and rewrite the fractions

Common denominator of 2 and 5 is 10

1/2 becomes 5/10

1/5 becomes 2/10

now you have 4 5/10 + 1 2/10 = 5 7/10 + 2 = 7 7/10

Now subtract that from 12:

12 - 7 7/10 = 4 3/10 hours

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.