C.add10 is the correct answer
First we need to know how much each pen costs. So we take 11.77 and divide it by 11. That gives us 1.07 per pen. So answer choice A has 4 pens for 4.44, so we need to multiply 1.07 x 4. That gives you 4.28, so we know that isn't the correct answer. For option B, we need to multiply 1.07 x 5. That is 5.35, so that also can't be the answer. For C, we need to do 1.07 x 6, and that gives us 6.42. So we know the correct answer is option C.
Answer:
Step-by-step explanation:
Answer:
places.
Step-by-step explanation:
There are seven zeros, so in powers of ten notation it is written as 
Answer:
9-63x
Step-by-step explanation:
9(1-7x)
9-63x
