Question : The demand curve will shift forward when ______.

Option 1: price of complementary goods fall

Option 2: price of substitute goods decreases

Option 3: income of consumer fall

Option 4: price of complement goods increases

Question : Products that have alternative uses are known as:

Option 1: Substitute goods

Option 2: Complementary goods

Option 3: Comfort goods

Option 4: None of these

Question : If $x^4+x^2 y^2+y^4=133$ and $x^2-x y+y^2=7$, then what is the value of $xy$?

Option 1: 8

Option 2: 12

Option 3: 4

Option 4: 6

Question : Which of the following statements is correct?
I. If $x=12, y=-2$ and $z=-10$, then $x^3+y^3+z^3=360$.
II. If $x+y=48$ and $4 x y=128$, then $4 x^2+4 y^2=4480$.

Option 1: Neither I nor II

Option 2: Only I

Option 3: Both I and II

Option 4: Only II

Question : If $x+y+z=17, x y z=171$ and $x y+y z+z x=111$, then the value of $\sqrt[3]{\left(x^3+y^3+z^3+x y z\right)}$ is:

Option 1: –64

Option 2: 4

Option 3: 0

Option 4: –4