Jim has gotten scores of 99 and 93 on his first two tests. what score must he get on his third test to keep an average of 90 or
1 answer:
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For this case we have to define trigonometric relations of rectangular triangles that:
- The cosine of an angle is given by the leg adjacent to the angle on the hypotenuse of the triangle.
- The sine of an angle is given by the leg opposite the angle on the hypotenuse of the triangle.
Then, according to the figure we have:
Answer:
Option D
No, John is incorrect.
<h3>Correct work shown:</h3>
The correct answer should be x = 7 or x = -1
-
=
*
-
= 9(
) - 1(
) = 8(
)
-
=
⇒ 8() =
⇒ =
<em>multiplied both sides by 8</em>
⇒ =
⇒ = 3⁻²
⇒ x = -2
Answer: x = -2