exam Maths Puzzle Numerical Ability

Would someone check this for me and see if it is correct? I do apreciate it and thank you so much.

Add -3/5 + (8/35)

My answer is -13/35

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exam Other Question

Please help, I am stuck again.....

Use a coefficient of friction of 0.4 in the formula from example 6 and find the speeds of cars that left skid marks oflenghts 150 feet, 200 fe
Please help me with this. I am no good at this stuff.
Find the slope of the line through the following pairs of points.
(-5, -3) and (-5, 2)