Perimeter and area with binomials

Find the value of y if the measure of the vertex angle is 64 and one base angle is (2y-11)

3/7 x 28/9 x 15/17 ... how do I use cancellation? my answer was 15/17 but thats not the right answer, can someone explain this and cancelling factors to me?

Explain 3 1/5 * 5/8 i need an explanation or i wont get full marks

Fref picked 1 4/9 bucket of lemons, and mary picked 1 1/12 buckets of lemons. How many buckets total did they pick

Waht is 30.75 divied by - 3?

The property that justifies the sentence 2x2 + (5x + 1) = (2x2 + 5x) + 1 is:

Devon babysits x hours a week after school for 5$ an hour, and also has a job as a cashier y hours a week for $10 an hour. He wants to earn atleast 70$. He can't work any more than 10 hours a week because of school.

Emergancy final exam! The base length of a triangle is 8 feet and the height is 4 feet. What is the area of the triangle?

4/5+2/3 i need to know the answer so i would know whats the answer.

Identify the slope of the line y=-3x - 4