Define the variables for the situation janas age plus 3 equals her sisters age

j = Jana's age

s = sister's age    (because you don't know what their ages are)

j + 3 = s

Jana's age(j) plus(+) 3 equals(=) her sister's age(s).

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!