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Bas_tet [7]
3 years ago
11

Evaluate the function f (x) = 4 • 7x for x = -1 and x = 2

Mathematics
2 answers:
coldgirl [10]3 years ago
5 0
F(x) = 4 x 7x

f(x) = 4 x 7(-1)
f(x) = 4 x (-7)
f(x) = -28
(-1, -28)

f(x) = 4 x 7(2)
f(x) = 4 x 14
f(x) = 56
(2, 56)

Hope this helps!!
~Kiwi
algol133 years ago
4 0
F(x)=56 and the order pair of the graph is (2,56)
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3 0
4 years ago
Andrew drives his car 145.5 miles in 3 hours. What is the constant of proportionality that related the total of miles, y, to the
makvit [3.9K]

Answer:

48.5

Step-by-step explanation:

The constant of proportionality in this case is the speed at which Andrew travels.

We know that the speed is equal to:

v = d / t

We know the distance that is 145.5 miles and the time is 3 hours, replacing:

v = 145.5 / 3

v = 48.5 mi / h

which means that the equation would be:

y = k * x

where k, that is, the constant of proportionality is the velocity 48.5.

y = 48.5 * x

To check if for example x is worth 3, it would be:

y = 48.5 * 3

y = 145.5

5 0
3 years ago
Fill in the table for the following question. y = 2x - 250
Kobotan [32]

EXPLANATION:

To find the value of y when x is equal to 1 I must follow the following steps:

1-Replace in the given equation in the variable x by the value of 1

2.Then I must perform the operation correctly.

The exercise is as follows:

\begin{gathered} y=2x-250 \\ y=2(1)-250 \\ y=2-250 \\ \textcolor{#FF7968}{y=-248} \\ \textcolor{#FF7968}{the}\text{\textcolor{#FF7968}{ answer is : when }}\textcolor{#FF7968}{x}\text{\textcolor{#FF7968}{ is equal a }}\textcolor{#FF7968}{to}\text{\textcolor{#FF7968}{ 1 ,}}\textcolor{#FF7968}{y}\text{\textcolor{#FF7968}{ is equal a to }}\textcolor{#FF7968}{-248} \end{gathered}

8 0
1 year ago
While measuring the ingredients for her pecan pie,Ashley discovered the only measuring cup she had measured 1/5.The pie calls fo
Leokris [45]
She would have to fill it 16 times
6 0
4 years ago
I've been stuck on this for so long and I have an exam soon, anybody who can help me :'( ?
san4es73 [151]
(i)  speed = distance / time
so time =  distance / speed
here we have

time t = 1080/x  hours

(ii) return flight  time  = 1080 / (x + 30)  hours

(a)  1080/x - 1080/(x + 30) = 1/2

Multiplying  through by the LCD 2x(x + 30) we get:-

1080*2(x + 30) - 2x*1080 = x(x+30)
2160x + 64800 - 2160x = x^2 + 30x
x^2 + 30x - 64800  = 0

(b)  factoring;  -64800 = 270 * -240  ans 270-240 = 30 so we have

(x + 270)(x - 240) = 0   so x = 240  ( we ignore the negative -270)

So the speed for outward journey is 240 km/hr

(c) time ffor outward flight = 1080 / 240 =  4 1/2  hours

(d) average speed for whole flight = distance / time
   Time for outward journey = 4.5 hours and time for  return journey = d / v
= 1080 / (240+30) =  4 hours
 Therefore the average speed for whole journey =  2160 / 8.5 = 254.1 km/hr
8 0
3 years ago
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