Use photo math, it will help you with your answer a lot more.
Answer:

Step-by-step explanation:
To begin simplifying this, we can first divide the coefficients, giving us:

We know that when dividing exponents, this means we need to subtract the exponent on the denominator from the numerator. This gives us:

Now, simplifying this gets:

Answer:
B. 840
Step-by-step explanation:
21 is 70% of 30 and 70% of 1,200 is 840.
Answer:
1. A
2. C
Step-by-step explanation:
FOR QUESTON 1: r/2 + ( 7/8 - s)
1/2 + ( 7/8 - 1/2) = 7/8 ( A )
FOR QUESTION 2: 2/3 ( n - 6) p
2/3 ( 10 - 6) 1/2 = 4/3 ( C )