It works because 7 x 9 x 10 is the same thing as 7 x 90, since 9 x 10 is just 90. So basically he is just writing more but the answer will still be the same.
Answer:
1/4 or 0.25
Step-by-step explanation:
I did this on a graphic calculator so i can't really explain, but I hope this helps! :)
Answer:
I'm pretty sure it's 13.
Step-by-step explanation:
Answer:
32inches
Step-by-step explanation:
i don't know if that's correct but since the diameter is 8 inches and the wheel would turn four times it will be 32
