Answer: option D
Step-by-step explanation:
Remember the cosine identity:

Given the right triangle DFE shown in the image, you can identify that the adjacent side and the hypotenuse for the angle F of this triangle are:

Now you can substitute values into
and then reduce the fraction.
THerefore you get:
Answer:
Step-by-step explanation:
perimeter means that you add up all the sides do the perimeter is 41
Answer:
61.89 miles per hour
Step-by-step explanation:
9 x 60 to get the minutes then add the extra 15
555/538 (minutes over miles)
1.0315 x 60 to get back to hours
61.89 miles per hour
Answer:
Step-by-step explanation: 60 x 3= 380
2 x 60= 270
270 + 380= 810