exam Maths Puzzle Numerical Ability

i need help with (2k+1)7. this is distributive property. its usually a number in front of the parenthesis but for this particular problem there is not so i am really confused

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Acetaminophen grain 5 has been ordered. The tablets are labeled 300 mg each. How many tabs will you give? Will you please show your work. Thanks so much. Lean a clown is preparing for a party by inflating 1 balloon for each invited guest
when she gets half the needed balloons done 3 of them pop she inflates 5 more and 2 pop then 6 ballo