10meters=1000cm
1000-210=890
Mary has 890 centimeters of thread left on the reel.
Answer:

Step-by-step explanation:
Pythagorean Theorem: 
BC= x
AB= 10 cm
AC= 8 cm
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Now, Substitute




Square root x^2= x, √(36)=6

Therefore, the length of x = 6
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Answer:
7664025600
Step-by-step explanation:
I basically just multiplied first then added the sums. Also you can use a calculator to make sure ur answer is right.
Answer:
B I'm pretty sure
Step-by-step explanation:
9 and 4 have 36 in common
to get 9 to 36 you multiply it by 4 and 2x4 is 8
to get 4 to 36 you multiply it by 9 and 1x9 is 9
9+8 is 17