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BARSIC [14]
2 years ago
11

Jean needs to rent a car for an upcoming buiness trip. The cost per day for the car is $30, and the one-time-refueling cost upon

return is $50. What is the function that relates the cost of the car, C, to the number of days it is rented, d?
Mathematics
1 answer:
IrinaVladis [17]2 years ago
8 0

Answer:

C = 50 + 30d

Step-by-step explanation:

For one day,

50 + 30

For two days

50 + 2(30)

For d days,

50 + d(30)

C = 50 + 30d

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Answer:

Step-by-step explanation:

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7 0
3 years ago
Prove that sin^4x + cos^4x= sinxcosx
yKpoI14uk [10]

Answer:

(the relation you wrote is not correct, there may be something missing, so I will simplify the initial expression)

Here we have the equation:

sin^4(x) + cos^4(x)

We can rewrite this as:

(sin^2(x))^2 + (cos^2(x))^2

Now we can add and subtract cos^2(x)*sin^2(x) to get:

(sin^2(x))^2 + (cos^2(x))^2 + 2*cos^2(x)*sin^2(x) - 2*cos^2(x)*sin^2(x)

We can complete squares to get:

(cos^2(x) + sin^2(x))^2 - 2*cos(x)^2*sin(x)^2

and we know that:

cos^2(x) + sin^2(x) = 1

then:

1 - 2*sin(x)^2*cos(x)^2

This is the closest expression to what you wrote.

We also know that:

sin(x)*cos(x) = (1/2)*sin(2*x)

If we replace that, we get:

1 - \frac{sin^2(2*x)}{2}

Then the simplification is:

cos^4(x) + sin^4(x)  = 1 - \frac{sin^2(2*x)}{2}

7 0
3 years ago
What’s the diameter of the circle of the circumference is 30 pi inches
ICE Princess25 [194]
30?
30pi = 2pi r
30pi / 2pi = 15
15 = r
double the radius to get the diameter
15)2 =30
6 0
3 years ago
Read 2 more answers
Im going to start giving hard questions now and who ever has the most professional answer or the correct answer gets brainliest.
PilotLPTM [1.2K]

Answer:

1. she has 30 ounces left

2. 4 left

3.8

Step-by-step explanation:

sorry cant do the rest :)

7 0
2 years ago
What is the solution set of 4x^2-36= 0?<br><br> (-3)<br> (3)<br> (-3,3)
ololo11 [35]

Answer:

(-3, 3).

Step-by-step explanation:

4x^2-36= 0

4x^2 = 36    Taking square roots of both sides:

2x = +/- 6

x = +/- 3.

6 0
3 years ago
Read 2 more answers
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