A.)which two of these expressions are equivalent to 3 x a b.)which two of these expressions are equivalent to a÷2

1.) B. a+a+a. and C. 3a

2.) B. ½a and D. a/2

Step-by-step explanation:

1.) 3 × a means add a three times. 3a means we have the value of three a's.

2.) Division is the same as making a fraction of the divisor.

ANSWER

C.

EXPLANATION

The period of a cosine function is calculated using the formula;

Therefore , if the period is 3π, then

We solve b to obtain,

This implies that, the given cosine function must have an equation of the form

Among the options, the function in this form is:

The correct choice is C.