Triangle klm represents a section of a park set aside for picnic tables. the picnic area will take up approximately 400 square yards in the park. trigonometric area formula: area = to the nearest yard, what amount of fencing is needed to surround the perimeter of the picnic area?

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.