Answer:
the last option
Step-by-step explanation:
can you show the rest of the last option? if there isn't anything cutoff, then the last option would be correct. also, you can use desmos .com next time to help you graph
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5.25ft
10.5ft÷42=0.25ft per inch
then 0.25(per inch) multiplied by 21 will give you 5.25ft which is your answer
x=1/36
6.8127 × 10^16
Hope this helps:)