In the following exercises, the transformation T : S → R , T ( u , v ) = ( x , y ) and the region R ⊂ R 2 are given. Find the region S ⊂ R 2 . 377. x = a u , y = b v , z = c w , R = { ( x , y ) | x 2 a 2 − y 2 b 2 − z 2 c 2 ≤ 1 , z > 0 } where a , b , c > 0
In the following exercises, the transformation T : S → R , T ( u , v ) = ( x , y ) and the region R ⊂ R 2 are given. Find the region S ⊂ R 2 . 377. x = a u , y = b v , z = c w , R = { ( x , y ) | x 2 a 2 − y 2 b 2 − z 2 c 2 ≤ 1 , z > 0 } where a , b , c > 0
Which of the following represents the graph of f(x)=3x-2?
3
2
•
6
3
2
0-
0-
•
3
2
0
-2
3
2) Suppose you start with $60 and increase this amount by 15%. Since 15% of $60 is $9,
that means you increase your $60 by $9, so you now have $69. Notice that we did this
calculation in two steps: first we multiplied $60 by 0.15 to find 15% of $60, then we
added this amount to our original $60. Explain why it makes sense that increasing $60 by
15% can also be accomplished in one step by multiplying $60 times 1.15.
3) Suppose you have $60 and want to decrease this amount by 15%. Since 15% of $60 is $9,
that means you will decrease your $60 by $9, so you now have $51. Notice that we did this
calculation in two steps: first we multiplied $60 by 0.15 to find 15% of $60, then we
subtracted this amount from our original $60. Explain why it makes sense that decreasing
$60 by 15% can also be accomplished in one step by multiplying $60 times 0.85.
4) In the Read and Study section, we noted that the population in Colony B is increasing each
year by 25%. Which other colony in the Class Activity…
Suppose an experiment was conducted to compare the mileage(km) per litre
obtained by competing brands of petrol I,II,III. Three new Mazda, three new
Toyota and three new Nissan cars were available for experimentation. During the
experiment the cars would operate under same conditions in order to eliminate
the effect of external variables on the distance travelled per litre on the assigned
brand of petrol. The data is given as below:
Brands of Petrol Mazda Toyota Nissan
I 10.6 12.0 11.0
II 9.0 15.0 12.0
III 12.0 17.4 13.0
(a) Test at the 5% level of significance whether there are signi
cant differences among the brands of fuels and also among the cars. [10]
(b) Compute the standard error for comparing any two fuel brands means. Hence
compare, at the 5% level of significance, each of fuel brands II, and III with
the standard fuel brand I. [10]
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