Question

The exponent of the variable b in Marina’s solution should be

-7
-1
7
1

Answer 1

Answer:

Option C is answer.

Step-by-step explanation:

Here we can see the  terms of b are in the numerator and in denominator

but sign of exponent of b in the denominator is negative

therefore for simplifying the exponent of b ,we have to apply exponent rule of division which is $\frac{a^m}{a^n} =a^{m-n}$

Here terms of b are $\frac{b^4}{b^-3} =b^{4-(-3)}$

                               $b^7$

therefore exponent of b is 7 on simplifying.

Answer 2

Answer: 7

Step-by-step explanation:

Keeping on mind the exponents properties, when you have two powers with equal base and they are dividing each other, you must subtract the exponents.

The exponents of b in the numerator is 4 and in the denominator is 3. Therefore you have:

$b^{4-(-3)}=b^{7}$

The exponent is 7