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KATRIN_1 [288]
3 years ago
8

The quadratic function d = –3x^2 + 16 models a skateboarder’s distance, in feet, from the bottom of a hill x seconds after the s

kateboarder starts moving down the hill. After how many seconds is the skateboarder 8 ft from the bottom of the hill?
Mathematics
2 answers:
mihalych1998 [28]3 years ago
8 0

Answer:

To find the solution, plug in 8 for d

d=-3x2+16  

8=-3x2+16  Subtract 8 from both sides

0=-3x2+8

Now, use the quadratic equation to solve for x  

 

a=-3

b=0

c=8

x=1.63 or  

C. 1.6s

Step-by-step explanation:

earnstyle [38]3 years ago
4 0
The Answer is 1.6

Hope this helps
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Step-by-step explanation:

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Gala2k [10]

Answer: y = -1/2

Step-by-step explanation:

Subtract both sides by 7/8

y = 3/8 - 7/8

Then combine like terms

y = -4/8

Then simplify

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3 years ago
Consider the diagram below. Which of the following is the value of X?
Vaselesa [24]

Answer:

x=20

Step-by-step explanation:

45= measure of angle 6 (vertical angles)

45+ 5x+35 = 180 (Supplementary angles)

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3 years ago
Simplify this expression 4(1-2b)+7b-10
Bess [88]

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mutiply the bracket by 4

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Consider the following table.
kobusy [5.1K]

Answer:

The function for the model that gives the pressure in atm is given as:

P = 1.000 + 0.030*D

Step-by-step explanation:

From the question, we are given the Depth with corresponding P. Our duty is to calculate the Pressure (P) in the atm given the Depth (D). From this, we know that:

1. Pressure (P) is the dependent variable, and

2. Depth (D) is the independent variable.

Hence the function is a linear relationship which is known as regression equation. This can be achieve by estimating the:

i) Slope (β), and

ii) Intercept (α).

We can obtain the slope by:

\beta = \frac{n\sum(P)\sum(D) -  \sum{PD}}{n\sum{D}^2 - (\sum{D})^2}, and

\alpha = \frac{\sum{P}}{n} - \beta \frac{\sum{D}}{n}.

Hence, the function is:

\hat{P} = α + β D

You can achieve the task through R programming. Here is the R code.

#... this code in R programming

D = c(0,33,66,99,132)

P = c(1,2,3,4,5)

mod = lm(P~D)

mod.

############################

And we obtained P = 1.000 + 0.030 D

7 0
4 years ago
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