First attachment:
Indication words: each, gives, left.
> Each indicates multiplication
> left and gives indicate subtraction.
''5 packs obtains 4 cards each. 3 cards are given away,'' translates to 5 * 4 - 3
Therefore B = 5 * 4 - 3
Second attachment:
Indication words: more, gives.
> More signifies addition
> Gives signifies subtraction.
The equation would be 229 + 35 - 149 = ?
Use PEMDAS. Note that you do addition first since it's before subtraction when we read this equation question left to right.
229 + 35 - 149 = ? ⇒(229 + 35) - 149 = ? ⇒ 264 - 149 = 115; ? is 115
Answer: 115
Third attachment:
I cannot answer; I don't know the choices in the choose boxes.
Fourth attachment:
You are incorrect for Part A. Raising 9 dollars EACH (*) day for a week (7 days) translates to, in mathematical terms, 9 * 7. 9 multiplied by 7 equals 63.
The goal was to get to 439 dollars. If they have 63, how much MORE (+) do they need? To solve this, we do inverse operations of addition which is subtraction. Take 439 and subtract it by 63. 439 - 63 = 376. Check our work: 376 + 63 = 439? Yes.
In conclusion the answer for Part A is A; $376.
Part B -
Answer 1: 9 book covers (9 * 8 = 72 ) + 1 calculator (1 * 9 = 9) = 81. Do not check this off because the result is not exactly 80.
Answer 2: 1 binder (1 * 4=4) + 8 calculators (8 * 9= 72) = 76. Do not check this off because the result is not exactly 80.
Answer 3: 1 book cover (1 * 8 = 8) + 8 calculators (8 * 9 = 72) = 80. Check this because the result is exactly 80.
Answer 4: 7 calculators (7 * 9 = 63) + 1 stapler (1 * 17) = 80. Check this because the result is exactly 80.
Answer 3 and 4 are correct in summary.