Which set of steps could be used to solve this story problem? helen read 4 books per week for the first 3 weeks of her summer vacation. she read 2 books per week for the last 4 weeks. she also read 2 magazines each week. how many books did helen read over summer vacation? a. multiply 4 by 3. then multiply 2 by 4. add the two products. b. add 3 and 4. then add 2 and 4. add the two sums. c. multiply 3 × 4. then add 4 to that product. then subtract 2. d. add 4 and 4. then divide that sum by 2 and add 3 to the quotient.

  A.  Multiply 4 by 3. Then multiply 2 by 4. Add the two products.

Step-by-step explanation:

As with many rate problems, ...

  quantity = rate · time

The total quantity will be the sum of quantities associated with different rates or time periods:

  total quantity = quantity1 + quantity2

  = (rate 1)(time 1) + (rate 2)(time 2)

  = (4 books/week)(3 weeks) + (2 books/week)(4 weeks)

  = 4·3 books + 2·4 books . . . . . . units of (weeks/weeks) cancel

  = (4·3 + 2·4) books . . . . . . formula matches selection A

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680

a

step-by-step explanation:

the answer is a