The best one that is described is the first one
Answer: option c. She subtracted the coefficients instead of dividing them
Explanation:
1) Starting expression (given):
2) Simplified expression (given)
3) Note that if you do the operations correctly you get:
i) By dividing the coefficients:
ii) By subtracting the exponents
And that is the correct result.
4) But if you subtract the coefficients, instead of dividing them, then you get 10 - ( - 5) = 10 + 5 = 15
Which is what she obtained in the numerator. And this is wrong, because the coefficients must be divided.
It is the exponents what you subtract, as per the rule of quotient of powers.
I think it is B. Hope this helps!
Answer:
8/5 or 1 3/5 ft
Step-by-step explanation:
The area of a rectangle is given by
A = l*w
The area is 4/5 and the width is 1/2
4/5 = 1/2 *l
Multiply each side by 2
2*4/5 = 2*1/2 *l
8/5 = l
Changing to a mixed number
l = 1 3/5