<span>These ones are correct:
Multiply the value of the first variable by one of the original equations to solve for the second variable.
</span><span>Solve for one of the variables
</span><span>Substitute the value of the known variable into one of the original equations to solve for the unknown variable.</span>
Answer:
Step-by-step explanation:
If a and (b - c^9/a) are both positive or both negatives, the quadratic will be either, always positive or negative.they are not both then, quadratic will be be positive for some values and negative for others.
Cos60° = 0.5
Any angle less than 90° is an acute angle.
Therefore, 60° is the acute angle.
Answer:
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Step-by-step explanation:
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