Answer:
x-y =2 …(1)
x+y = 4 …(2)
add (1) and (2), to get
2x = 6, or x = 3. From (1) y = 3–2 = 1.
So x = 3, y = 1.
For the first part, in the question, it is given that , Joey pays $672 per year in insurance .
And 1 year = 12 months.
It means, Joey pays $672 for 12 months in insurance .
So his monthly budget should be
Correct option is C .
In the second part, it is given that, The equation y = 1.55x + 110,419 approximates the total cost, in dollars, of raising a child in the united states from birth to 17 years, given the household's annual income, x .
So when annual income ,x, is 54000, we will get
Y ⇒⇒⇒ monthly income
x ⇒⇒⇒ number of times app is opened
<span>$20 per month and an additional $0.005 each time the app is opened
∴ y = 0.005 x + 20
The attached figure represents the graph of y
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Formula for Riemann Sum is:
interval is [1,3] so a = 1, b = 3
f(x) = 3x , sub into Riemann sum
Continue by simplifying using properties of summations.
Now you have an expression for the summation in terms of 'n'.
Next, take the limit as n-> infinity.
The limit of
goes to 0, therefore the limit of the summation is 12.
The area under the curve from [1,3] is equal to limit of summation which is 12.
The answer is 0.2 hope it helps