exam Maths Puzzle Numerical Ability

find the measure of the vertex angle of an isosceles triangle if the measure of each base angle is 42 degrees

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exam Other Question

What is the monomial that can be factored out of 4x^2 + 12x + 16? is has four choices to choose from...
(a) 2
(b) 2x
(C) 4
(d) 4x

THanks! Use the equation of the regression line to predict y when x = 20.

x = 5 8 6 10 12 9
y = 18 20 15 25 30 25

What answer would be correct?
45.5
50