Answer:
A
Step-by-step explanation:
The cosine of a right triangle is the adjacent over the hypotenuse. If the cosine is -3/5 then it must be a right triangle with sides 3, 4, & 5 since this is a Pythagorean triple. This means the sin will be -4/5. We know its negative because the tangent is positive so this is the 3rd quadrant where both Sine and Cosine are negative.
7x^2 + 3
7(4)^2 + 3
7(16) + 3
112 + 3
115.
The answer would be ~-2~
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Answer:
x=27
Step-by-step explanation:
m<AOB = 180
36+90+2x=180
x=27 degrees