I'm assuming that the correct answer to this problem was a, but i'm not sure why. how do i know when to use sin and when to use cosine when writing the equation for simple harmonic motion? i have attached a picture of the question by the way. you so much for your !

Can someone check my answer? you : )

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191