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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exam Other Question

A nut mixture contains 10% cashews. How many kilograms of the mixture and how many kilograms of cashews should be mixed to give 6 Kg of a nut mixture which is 25% cashews? Tutor can you help me to find the slope of these two lines y = -7.921 and
x = 9.124

Thank you