Math Questions! Need help please

Posted on 2017-03-20 18:50:00 in Math by ARICA

1. Which relationship shows a quadratic variation?

a] x = 1, 2, 3, 4 
f(x)= 4, 3, 2, 1 

b] x = 1, 2, 3, 4 
f(x)= 4, 16, 36, 64 

c] x = 1, 2, 3, 4 
f(x) = 3, 6, 9, 12 

d] x = 2, 3, 4, 5 
f(x)= 1, 4, 9, 16 

2. The variable y varies directly with x^2 and y = 48 when x=2 

a] y = 1/12 x^2 
b] y = 1/24 x^2 
c] y= 12 x^2 
d] y = 24 x^2 

3. Which relationship shown an inverse variation. 

a] x = 2, 4, 6, 8 
f(x) = 8, 6, 4, 2 

b] x = 2, 3, 4, 5 
f(x)= 30, 20, 15, 12 

c] x= 1, 2, 3, 4 
f(x)= 4, 3, 2, 1 

d] x = 1, 2, 3, 4 
f(x)= 2, 8, 18, 32 

4. y varies inversely with x and y = 5 when x = 2 

a] y = x + 2 
b] y = 10/x 
c] y = 1/2 x 
d] y - 2x 

5. The function f(x) varies directly with x and f(x)= 32 when x= -8 

What is f(x) when x = 4 

a] -12 
b] -1 
c] -16 
d] -8

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