Q 01/05

What do we call a natural number greater than 1 that is not a product of two smaller numbers?

A) Rational

B) Prime

C) Composite

D) Perfect

Answer · why

B) Prime

The primes are the building blocks of every whole number, which is why 1 is left out of the club.

Q 02/05

Which letter usually stands for the slope of a line in the equation y = mx + b?

A) b

B) y

C) x

D) m

Answer · why

D) m

Nobody is sure why m was chosen; it first shows up in an 1844 English textbook.

Q 03/05

Slope is defined as the ratio of which two things?

A) Base to height

B) Sine to cosine

C) Length to width

D) Rise to run

Answer · why

D) Rise to run

A steeper line has a bigger absolute slope; a horizontal line has slope zero.

Q 04/05

What is the maximum number of solutions a quadratic equation can have?

A) Four

B) Two

C) Five

D) Three

Answer · why

B) Two

The graph is a parabola, and a parabola can cross the x-axis at most twice.

Q 05/05

In ax² + bx + c = 0, what is the name given to c?

A) Discriminant

B) Linear coefficient

C) Constant coefficient

D) Quadratic coefficient

Answer · why

C) Constant coefficient

a is the quadratic coefficient and b the linear one; if a were zero the equation would just be linear.