4/5 y + 7/10 z - 1/5 y + 1/5 z . combine like terms .

3/5 y   +9/10 z

Step-by-step explanation:

4/5 y + 7/10 z - 1/5 y + 1/5 z

4/5 y - 1/5 y + 7/10 z + 1/5 z

We need to get a common denominator for the z term of 10

4/5 y - 1/5 y + 7/10 z + 1/5 *2/2 z

4/5 y - 1/5 y + 7/10 z + 2/10 z

3/5 y   +9/10 z

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!