Evan bought 6 batteries that cost $10 each and 6 batteries that cost $4 each the total cost was the same as he would have spent
1 answer:
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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:
