I need help on these problems please

6-11. Jesse wants to model the height of a yo-yo over time by using a trigonometric function. He starts timing the yo-yo when it is at its lowest position of 5 inches above position. the ground. The string length is 30 inches and it took 2.5 seconds to return to the same a. The graph to the right models the path of the yo-yo. Explain why it has a peak at 35 inches. 35- 30+ b. What is the amplitude of the function? 25+ 20+ c. In order to find the vertical shift, we need to height (inches) find the middle point between the high and 15+ low points. What is the vertical shift? 10- d. Recall the relationship pb = 2nt . Find the angular frequency for the graph. 2.5 time (seconds) e. The graph can be modeled without utilizing a horizontal shift. Which trigonometric function can be used as a basis for this graph? f. Put the above observations together to find a function that will model the height of the yo-yo over time. 6-12. Find the exact value of the following trig expressions. a. CSC STE b. tan - 6 C. cot Sit d. sec In 6 6-13. Consider the function f(x) = - (x -1)2 +7 for 15x $4. a. Write the sum to find the area under the curve using left-hand endpoints and rectangles with widths of 1. Since you are not using a calculator, be sure you set up your sum to include all of the factors. You do not need to actually calculate the sum. b . Write the sum using sigma notation. 6-14. 3 x - 2y = a Solve for x and y: (xty =b