exam Maths Puzzle Numerical Ability

simplify (10t^2-13t-9)+(2t+1)
a. 5t-7
b. 5t-9
c. 5t+9
d. 5t+7

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exam Other Question
In the movie, "The Wizard of Oz," the Wizard says, "The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side."

Is his statement correct?


 I have been trying to help my daughter with this problem:
A 6 pointed regular star is formed by two interlocking equilateral triangles. What is the ratio of the area of the entir