Elimination Round Level 5

 $\sqrt{2-x}-4=0$  Solve for x.

Find the sum of the first 20 positive odd numbers

What is the sum of the interior angles of a triangle?

• 180 degrees

• 90 degrees

• 45 degrees

• 60 degrees

Find the 7th term of the sequence: 1, 2, 4, ... ,a7.

How long is the hypotenuse of a right triangle if its two legs are 1 cm and 2 cm long?

•  $\sqrt{5}$  

•  $\sqrt{3}$  

•  $\sqrt{9}$  

•  $\sqrt{6}$  

A person is standing 40ft away from a street light that is 25ft tall. How tall is he if his shadow is 10ft long?

• 16 ft

• 24 ft

• 31 ft

• 47 ft

The difference of two numbers is 22. Which of the pair below makes their product the minimum?

• 11 and -11

• 22 and 0

• 30 and 8

• 20 and -2

Two sides of a rectangle are 9cm and 12cm long. Find the length of the diagonal.

• 15 cm

• 16 cm

• 17 cm

• 18 cm

 $f\left(x\right)=x^2-14x+c$  What value of c will make f(x) a perfect square?

 $9x^2-10=6$  Find the positive root of the given polynomial.