At Libby’s art and crafts, spoils of thread and 5 yards of fabric cost $22.33.

Need help ASAP 50 points ?!!!

Vera_Pavlovna [14]

Answer:

pretty sure it's 11

Step-by-step explanation:

Substitute x with -44

8 0

3 years ago

Read 2 more answers

The table below shows the score

ziro4ka [17]

Answer:

It increases by 2.5

Step-by-step explanation:

yeah

5 0

3 years ago

the distance between City a and City b is 200 mi. on a certain wall map this is represented by the length of 1.7 ft. On the map

ruslelena [56]

Given that:

the distance between City a and City b is 200 mi. on a certain wall map this is represented by the length of 1.7 ft.

So:

$\begin{gathered} 200\text{ mi=1.7 ft } \\ 1\text{ mi=}\frac{1.7}{200}ft \end{gathered}$

between City c and City d two cities that are actually 400 mi apart?:

So for 400 mi.

$\begin{gathered} 1\text{ mi=}\frac{1.7}{200}ft \\ 400\text{ mi=400}\times\frac{1.7}{200}ft \\ 400mi=2\times1.7ft \\ 400\text{ mi=3.4ft} \end{gathered}$

So 3.4 feet would there be between City c and City d two cities that are actually 400 mi apart

5 0

1 year ago

Pls help me with these questions

Butoxors [25]

Step-by-step explanation:

6 and 7 was already answered so I'll do 5 and 8.

5. The point the curve crosses the x axis is the x intercept, to find the x intercept of a rational function, we set y=0, and solve for x.

$0 = \frac{x - 4}{x}$

Set the numerator equal to 0.

$x - 4 = 0$

$x = 4$

So the x intercept is (4,0).

Next, to find gradient, we take the derivative of the function.

$\frac{x - 4}{x}$

We could use product rule, but for simplicity, serperate the function

$\frac{x}{x} - \frac{4}{x}$

$1 - \frac{4}{x}$

Next using exponents rules,

$1 - 4 {x}^{ - 1}$

Now we take the derivative,

Derivative of a constant is zero.

Derivative of a power function,

$n \times x {}^{n - 1}$

We move the exponent to the front, then we subtract the exponent by 1.

So, we get

$4 {x}^{ - 2}$

Now, we plug in. 4,

$4(4) {}^{ - 2}$

$4 \times \frac{1}{16} = \frac{1}{4}$

The slope or gradient at the x intercept is 1/4

8. The derivative of ax^2+bx, with respect to x is

$2ax + b$

When x=2, we have a gradient of 8.

$2a(2) + b = 8$

$4a + b = 8$

When x=-1, we have a gradient of -10.

$2a( - 1) + b = - 10$

$- 2a + b = - 10$

We have two system of equations,

$4a + b = 8$

$- 2a + b = - 10$

Let subtract the system to eliminate b.

$6a = 18$

$a = 3$

Plug 3 for a, back in to solve for b.

$4(3) + b = 8$

$12 + b = 8$

$b = - 4$

So a is 3

b is -4

3 0

2 years ago

We use a t distribution for inference about a population mean instead of the standard Normal distribution:

Basile [38]

Answer: d. if we do not know the population standard deviation and must use the sample standard deviation.

Step-by-step explanation:

We use t-distribution is quite similar to distribution of z-score .

The interpretation of t-scores and z-scores are same.

T- distribution is used when the data is not accurately normal and when the population standard deviation is unknown.

In the absence of population standard deviation , we use the standard deviation of the sample.

So , We use a t distribution for inference about a population mean instead of the standard Normal distribution if we do not know the population standard deviation and must use the sample standard deviation.

Hence, the correct option is : d. if we do not know the population standard deviation and must use the sample standard deviation.

3 0

3 years ago