exam Maths Puzzle Numerical Ability

I need help on this. Thanks.

Page 196

Number 4

A value decreased by 7

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exam Other Question

How would you be able to condense the Logarithm 2logx ? I am having a hard time understanding how to find the slope of an equation.

the problem is:

y = -10x + 7

i gave the problem a shot, and i came up with 0.7 as the answer. if anyone can help...thank you in advance!!!