A candy store keeps track of its sales during the month of October. Below is the number of sales for the first, second, third an
d fourth week of the month.
Week 1 ; 2 ; 3 ; 4
Candy Sales 97 ; 168 ; 259 ; 375
Which graph could represent the data shown below?
Week 1 ; 2 ; 3 ; 4
Candy Sales 97 ; 168 ; 259 ; 375
Which graph could represent the data shown below?
2 answers:
From the attached diagram you can see that regression that best fits given data is quadratic (not linear).
- option 1 is false, because it gives linear regression;
- option 2 is true, it gives graph, similar to quadratic parabola;
- options 3 and 4 are false, because graphs are decreasing.
Answer: correct choice is B.
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See the picture attached to better understand the problem
we know that
in the right triangle ABC
cos A=AC/AB
cos A=1/3
so
1/3=AC/AB----->AB=3*AC-----> square----> AB²=9*AC²----> equation 1
applying the Pythagoras Theorem
BC²+AC²=AB²-----> 2²+AC²=AB²---> 4+AC²=AB²----> equation 2
substitute equation 1 in equation 2
4+AC²=9*AC²----> 8*AC²=4----> AC²=1/2----> AC=√2/2
so
AB²=9*AC²----> AB²=9*(√2/2)²----> AB=(3√2)/2
the answer is
the hypotenuse is (3√2)/2
we know that
in the right triangle ABC
cos A=AC/AB
cos A=1/3
so
1/3=AC/AB----->AB=3*AC-----> square----> AB²=9*AC²----> equation 1
applying the Pythagoras Theorem
BC²+AC²=AB²-----> 2²+AC²=AB²---> 4+AC²=AB²----> equation 2
substitute equation 1 in equation 2
4+AC²=9*AC²----> 8*AC²=4----> AC²=1/2----> AC=√2/2
so
AB²=9*AC²----> AB²=9*(√2/2)²----> AB=(3√2)/2
the answer is
the hypotenuse is (3√2)/2