Question

What is the value of x to the nearest tenth?A.25.7B.43.2C.88.8D.89.7

Answer 1

`\begin{gathered} 70^2=52^2+48^2-2\cdot52\cdot48\cdot\cos x\rightarrow \\ 4900=5008-4992\cdot\cos x\rightarrow\cos x=(4900-5008)/(-4992)=(108)/(4992) \\ x=\arccos (108)/(4992)=88.8 \end{gathered}`