The two variables that we should use are:
- x = number of minutes that the call lasted.
- y = cost of that call.
<h3>
What variables should we use?</h3>
Here we want to study a relation between the cost per call as the function of the minutes that the call lasted.
So, we need to use two variables, x will be the number of minutes that call lasted, this is the independent variable.
And the variable that depends on that should be the cost of the call, let's say, y is the cost of the call.
These are the two variables that we need to model the situation:
y = f(x)
There says:
<em>"The cost of the call is a </em><em>function </em><em>of the number of minutes that the call lasted".</em>
<em />
If you want to learn more about functions, you can read:
<em>brainly.com/question/4025726</em>
Answer:
40
Step-by-step explanation:
2 •(3(5+2)-1)
2 ·(3(7)-1)
2·(21-1)
2·20
=40
9/11=x/22
11*2=22
9*2=x
x=18
9/11=18/22
Answer:
please mark me as brainlist please
Step-by-step explanation:
we know, ∠BGA = 90
In right angled triangle BGA
AB = 12 cm (diameter of circle)
⇒ (AB)2 = (AG)2 + (BG)2
⇒ 122 = 82 + (BG)2
⇒ BG = 4√5
In right angled triangle BCG
Let CG be x cm.
⇒ (BC)2 = (CG)2 + (BG)2
⇒ (BC)2 = x2 + (4√5)2 ----(1)
As we know,
⇒ (BC)2 = CG × CA ----(2)
From equation (1) and equation (2)
⇒ x2 + (4√5)2 = x × (x + 8)
⇒ x2 + (4√5)2 = x2 + 8x
⇒ 8x = 80
⇒ x = 10 cm
From equation (2)
⇒ (BC)2 = CG × CA
⇒ (BC)2 = 10 × 18 = 180
⇒ BC = √180 = 6√5
6 × 5 = 30
