exam Maths Puzzle Numerical Ability

1. Solve the following equation algebraically for all values of x in the interval 0 degrees is less than or equal to x is less than or equal to 180 dregrees. 2sinx-1=0
2. On Janua

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exam Other Question

Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = -3x + 1.

A) y = 3x + 5 B) y = - x + 5 C) y = x + 5 D) y = -3x + 5
I drew the pentagon and not sure if I found all the triangles, I found 20 is this right or are there more. Heres the question. Thanks for your help.

Draw a pentagon with each of its five diagonals. How many triangles are contained in the figure?