Question

Evaluate 15cos60 Options are A) -0.5 B)7.5 C)-14.5

Answer 1

$\cos60^o=\dfrac{1}{2}\\\\\text{Therefore}\\\\15\cos60^o=15\cdot\dfrac{1}{2}=7.5\\\\Answer:\ \boxed{B)\ 7.5}$

Answer 2

Answer:

The correct option is B.

Step-by-step explanation:

The given expression is

$15\cos (60^{\circ})$

We already know that

$\cos (60^{\circ})=\frac{1}{2}$

Put this value in the given expression.

$15\cos (60^{\circ})=15\times \frac{1}{2}$

$15\cos (60^{\circ})=\frac{15}{2}$

$15\cos (60^{\circ})=7.5$

The value of given expression is 7.5. Therefore the correct option is B.