Which equation represents this statement? one-third of a number is 21.
a. 21 x = 3
b. 21 3 = x
c. 1 3 x = 21
d. 1 3 (21) = x?

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The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Which of these triangle pairs can be mapped to each other using a single translation? cof hn