In this problem, you have two fractions being multiplied. You can first divide and cancel the coefficients in the numerators and denominators, by dividing 10 and 5 each by 5 and dividing 21 and 7 each by 7:

Next you can multiply the two numerators, and multiply the two denominators. Remember that when multiplying like variables with exponents, you add the exponents together:

If a variable shows up in both the numerator and denominator, you can simplify by subtracting the numerator's exponent by the denominator's exponent:

In this problem, you have two fractions being multiplied. You can first divide and cancel the coefficients in the numerators and denominators. The two coefficients in the denominators multiply up to 15, allowing you to divide and cancel those two coefficients with the 15 in the numerator:

Next you can multiply the two numerators, and multiply the two denominators. Remember that when multiplying like variables with exponents, you add the exponents together:

If a variable shows up in both the numerator and denominator, you can simplify by subtracting the numerator's exponent by the denominator's exponent. If you end up with a negative exponent in the numerator, you can move the variable and exponent to the denominator to make it positive:

Multiplying quotients is similar to multiplying fractions, so we multiply straight across to get . From this point, we can simplify. Since  and  , our final answer becomes .

Combine like terms in the numerator and the denominator. Use the rules of exponents to combine  and  in the numerator and  and  in the denominator. Remember that Then, divide 30 by 5 (the GCF). 

The GCF rule can also be used to remove  from the numerator and the deonominator.  goes into  once.

Since there are no like terms in the numerator or in the denominator, you can only combine ther terms on the numerator and denominator so that they are in one quotient. You cannot further combine the variables because each variable is represented by a different letter. You cannot further reduce the integers because they do not have a common factor. 

To solve this problem, split it into two steps:

1. Multiply the variables. We also need to remember the following laws of exponents rule: When multiplying variables, add the exponents.

2. Combine this with the remaining coefficient to get the final answer:

To solve this problem, split it into two steps:

1. Multiply the coefficients

2. Multiply the variables. We also need to remember the following laws of exponents rule: When multiplying variables, add the exponents.

Combine these to get the final answer:

To solve this problem, split it into two steps:

1. Multiply the coefficients

2. Combine this number with the single variable to get the final answer:

To solve this problem, split it into two steps:

1. Multiply the coefficients

2. Multiply the variables. We also need to remember the following laws of exponents rule: When multiplying variables, add the exponents.

Combine these to get the final answer:

To solve this problem, split it into two steps:

1. Multiply the coefficients

2. Multiply the variables. We also need to remember the following laws of exponents rule: When multiplying variables, add the exponents.

Combine these to get the final answer: