Find the value of cos⁻¹ (cos7π/6).
1 answer:
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Substitute x = 5 in the equation.
Therefore, the answer is -15 or last choice when x = 5.
We can set this problem up as an algebraic equation, which we can then solve to find our answer.
We start at -3. So we can start our equation with that:
However, this doesn't represent any change in temperature, just that we start at -3. To show change, we will use the variable , where
stands for the number of hours. Each hour accounts for a change of -2.5 in degrees, meaning that we must multiply our
by -2.5. We can now add this term into our equation:
We are trying to find when we will reach -18 degrees, so we will set our entire equation equal to -18 and solve:
It will take us 6 hours, or choice A.
I am sending more pictures so you can see how I got the answer
