Solve the problem.Martin saves $5 on the first day of a 10-day period, $10 on the second day, and so on. For the next 10 days, he increases the amount saved by $10 each day (instead of $5 each day). How much will he have saved after 20 days?
A. $1350
B. $1325
C. $1300
D. $1400
Answer: B
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A. (2x - 3t)(4x - 3t) B. (2x + 3t)(4x + 3t) C. prime D. (8x - 3t)(x - 3t)
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A. Yes B. No
A radioactive substance decays at a rate directly proportional to the amount present. If the substance is present in the amount of 
g initially 
, find the amount present in grams at any time
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