anonymous
  • anonymous
Algebra!
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Sandi tracks her calories burned during water aerobics class. The number of calories she burns is expressed by the function c(t) = 350t, where t is the number of hours spent doing water aerobics. To burn more calories, Sandi wears ankle weights during her class. The number of calories she burns while wearing ankle weights is expressed by the function b(c) = 1.2c, where c is the number of calories burned doing water aerobics without weights. Which of the following composite functions expresses the calories, as a function of time, Sandi burns while doing water aerobics with ankle weights?
anonymous
  • anonymous
b[c(t)] = 351.2t b[c(t)] = 420t c[b(t)] = 351.2t c[b(t)] = 420t

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welshfella
  • welshfella
the 35 is replaced by 12.*350 b(c(t)) = (1.2*350) t
welshfella
  • welshfella
now you just simplify
anonymous
  • anonymous
I got B
welshfella
  • welshfella
that correct

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