book Maths Puzzle Numerical Ability

The degree measures of the angles of a triangle are (2x+4), (x-10) , (3x-6)
-find the value of x
-find the measure of each angle
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book Other Question

my questions is :
find the value of r so that the line through (8,r) and (4,5) has a slope of -4.

a.11
b.-11
c.4
d.-4
thanks for your help!
Some students planned for a get together. The budget for food was $500.00. Five of the students failed to come because of the distance and therefore the cost of food for each stud