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1 year ago

14

Determine whether y = -2x² - 3 is a function.

1 answer:

Alexus [3.1K]1 year ago

5 0

Answer:yes

Step-by-step explanation:

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Help plssssssssssssss?

rosijanka [135]

Answer:

2

Step-by-step explanation:

because when x, the input, is -3, the y, the output, is 3

5 0

2 years ago

An equation for the depreciation of a car is given by y = A(1 – r)t , where y = current value of the car, A = original cost, r =

Mamont248 [21]

<h2>The car is about 6.6 years old.</h2>

Step-by-step explanation:

Given : An equation for the depreciation of a car is given by $y = A(1-r)^t$ , where y = current value of the car, A = original cost, r = rate of depreciation, and t = time, in years. The value of a car is half what it originally cost. The rate of depreciation is 10%.

To find : Approximately how old is the car?

Solution :

The value of a car is half what it originally cost i.e. $y=\frac{1}{2} A$

The rate of depreciation is 10% i.e. r=10%=0.1

Substitute in the equation, $y = A(1-r)^t$

$\frac{1}{2} A= A(1-0.1)^t$

$\frac{1}{2}= (0.9)^t$

Taking log both side,

$\log(\frac{1}{2})=t\log (0.9)$

$t=\frac{\log(\frac{1}{2})}{\log (0.9)}$

$t=6.57$

$t\approx 6.6$

Therefore, the car is about 6.6 years old.

3 0

3 years ago

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Maria wants to draw a painting with an area of 40 square inches. If she drew her painting on 1-inch grid paper how many squares

Darya [45]

If each square in the grid is 1 inch, each square has an area of 1cm^2

so the number of squares required is 40/1 = 40 squares.

7 0

3 years ago

A store marks up its notebook computers by 22%. What price does the store charge

Hoochie [10]

$732 I believe, hope this helps! <3

4 0

3 years ago

63 is 90% of what number

otez555 [7]

The answer is 70.

You can just divide 63 by 0.9.

Hope this helped. :)

8 0

2 years ago

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