formative task 1

we can show it better as follows:

Ausdruck 10: "y" equals 50cosine StartFraction, 2 pi Over 15 , EndFraction left parenthesis, "x" minus 15 halves , right parenthesis plus 62.5

you could have used the sine equation as well. Check the next equation. Remember the question asked you to find the cosine function.

Ausdruck 12: "y" equals 50sine left parenthesis, StartFraction, 2 pi "x" Over 15 , EndFraction minus StartFraction, pi Over 2 , EndFraction , right parenthesis plus 62.5

i will add the following intervals so that we will see just the first 30 minutes on the graph. You do not have to do this step. I arrange the numbers of the x axis from the settings.

Ausdruck 14: "y" equals 50cosine left parenthesis, StartFraction, 2 pi "x" Over 15 , EndFraction minus pi , right parenthesis plus 62.5 left brace, 0 less than or equal to "x" less than or equal to 30 , right brace

use y=100 for finding the times when the altitude is 100 meters

Ausdruck 16: "y" equals 100

negative 10

100

FINAL ANSWER

Ausdruck 18: "y" equals 50cosine StartFraction, 2 pi Over 15 , EndFraction left parenthesis, "x" minus 15 halves , right parenthesis plus 62.5 left brace, 0 less than or equal to "x" less than or equal to 30 , right brace