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3 years ago

I need help with 4-7

Mathematics

1 answer:

vlada-n [284]3 years ago

6 0

To make the problem more understandable... split the numbers you have 4 and negative 7. so remember that it is a negative number do 7-4, to get 3. But now remember it was a negative number so it would essentially be -3.

if you don't know what I did all I did was switch the number and keep the negative in the center, then I added the negative back to the equation to get my solution.

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A prize of $100,$200,$500, or $1000 will be randomly awarded to a game show contestant, with the probabilities of winning each p

guajiro [1.7K]

Answer: 400

Step-by-step explanation:

A P E X

4 0

4 years ago

An airplane flies with a constant

lora16 [44]

Answer:

1 hour and 30 minutes.

Here's how I did it:

960/3 = 220

220 = 30 minutes

220 = 30 minutes x 3 = 960

30x3=90

90 has to be converted into minutes and hours

so 90 = 1:30

7 0

3 years ago

Solve −3x2 + 30x − 90 = 0

Ray Of Light [21]

Step-by-step explanation:

so, it is a quadratic equation :

-3x² + 30x - 90 = 0

the first thing we can do is divide by 3

-x² + 10x - 30 = 0

remember, the formula to solve and find the 2 solutions is

x = (-b ± sqrt(b² - 4ac))/(2a)

in our case here

a = -1

b = 10

c = -30

x = (-10 ± sqrt(100 - 4×-1×-30))/-2 =

= (-10 ± sqrt(100 - 120))/-2 = (-10 ± sqrt(-20))/-2 =

= (-10 ± sqrt(4×5)i)/-2 = (-10 ± 2×sqrt(5)i)/-2 =

= 5 ± -sqrt(5)i

x1 = 5 - sqrt(5)i

x2 = 5 + sqrt(5)i

remember, i = sqrt(-1), a complex number.

6 0

3 years ago

Can anyone solve ? This one is beyond me

Makovka662 [10]

Answer:

$Rate = 0.13$

Step-by-step explanation:

Given

$y = \sqrt[3] x$

Required

Determine the average rate of change over [2,7]

This is calculated as:

$Rate = \frac{f(b) - f(a)}{b - a}$

In this case:

$b = 7$ and $a = 2$

So, we have:

$Rate = \frac{f(7) - f(2)}{7-2}$

$Rate = \frac{f(7) - f(2)}{5}$

From the table:

f(7) = 1.91

f(2) = 1.26

$Rate = \frac{1.91 - 1.26}{5}$

$Rate = \frac{0.65}{5}$

$Rate = 0.13$

5 0

3 years ago

A box contains 6 black pens, 4 blue pens, and 7 red pens. Without looking, Clarissa randomly picks a black pen out of the box. I

Irina18 [472]

Answer:

31.35%

Step-by-step explanation:

<h3>Initial reading:</h3>

In the box, there are:

6 Black pens
4 blue pens
7 red pens

Total number of pens in the box = 6 + 4 + 7

= 17

If we count pens as outcomes the total number of possible outcomes are 17.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

<h3>New reading:</h3>

Clarissa takes out a black pen from the box.

That reduces the number of black pens by 1 which increases the total number of pens by 1 as well.

So now:

Number of black pens = 6 - 1 = 5 
Total number of pens = 17 - 1 = 16

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

<h3>Probability:</h3>

$\boxed{ \mathsf{probability = \frac{favorable \: outcomes}{total \: outcomes} }}$

If we want her to pick up a black pen, and she ends up picking one. So, we can say that the outcome is in our favor.

That makes it,

the number of favorable outcomes = number of black pens

= 5

and total outcomes = Total number of pens

= 16

$\implies\mathsf{probability = \frac{5}{16} }$

For showing it as some percent we'll just multiply the fraction by 100

$\implies \mathsf{ \frac{5}{16} \times 100 }$

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

<h3>As a percent:</h3>

$\implies \mathsf{ \underline{ 31.25 \: \% } }$

4 0

3 years ago