exam Maths Puzzle Numerical Ability

Find the slope of the given line, if it is defined
y=-3/2x+-4

How do I solve this problem

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exam Other Question

Given f(x) = -x3 - 3x2 - 2x - 6, find f(-3), f(0), and f(3)
Now do I have to substitue a number for x? I am so confused!! Thanks for your help! CONVERT THE RATE INTO THE GIVES UNITS

1) 20 mi/h to feet per second

2)1 gal/h to ounces per second

3)50 km/h to miles per hour