Question

the equation $cos^{-1}left(\frac{3.4}{10}
ight)=x$ can be used to determine the measure of angle bac.
what is the degree measure of angle bac? round to the nearest whole degree.
$\bigcirc$ $19^circ$
$\bigcirc$ $20^circ$
$\bigcirc$ $70^circ$
$\bigcirc$ $71^circ$

Explanation:

Step1: Calculate the fraction

$\frac{3.4}{10} = 0.34$

Step2: Compute arccosine of 0.34

$x = \cos^{-1}(0.34)$

Step3: Convert to degrees and round

Using a calculator, $\cos^{-1}(0.34) \approx 70.12^\circ$, rounded to the nearest whole degree is $70^\circ$.

Answer:

70°