book Maths Puzzle Numerical Ability

Find a1 of arithmetic sequence from given information.
a7=-45 a15=-77

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book Other Question

find the slope of a line that is parallel to and slope of a line that is perpendicular to the following line: 3x+y=4

Thanks Caroline Question - How do I go about solving this problem??

The numerical value of eight more than the difference of 12 and 9 is 3.

True or false