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3 years ago

-9 - (-7) = ? Someone please explain

Mathematics

2 answers:

Nana76 [90]3 years ago

6 0

So keep in mind a negative minus a negative is the same as a negative plus a positive. For example -9-(-7) is the same as -9+7 because the 2 minuses cancel each other. So all you have to do is -9 + 7 = -2. If you’re confused, try looking on a number line and count it.

castortr0y [4]3 years ago

3 0

-9-(-7)
-9+7=-2
....:,.,

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In the math equation W=F*D what relationship is required for work to be done

DochEvi [55]

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3 years ago

A special type of autonomous differential equation, called the logistic equation, is typically written as Cape = rP(1- ), and is

kipiarov [429]

Answer:

a) dP / dt = 0.15*P ( 1 - P/750) , r = 0.15 , K = 750

b) decreasing : ( - inf , 0 ) & ( 750 , inf )

increasing : ( 0 , 750 )

Step-by-step explanation:

Given:

- The standard for of logistic equation:

dP / dt = r*P( 1 - P/K)

Where, r and K are constants.

- The given experimental relation is:

dP / dt = 0.15*P - 0.0002*P^2

Find:

Rewrite the equation in the typical form to determine the intrinsic growth rate(r) and environmental carrying capacity (K).

For what values of P is the population increasing and decreasing? Write your answers in interval notation

Solution:

- First we will convert the given relation into standard form as follows:

dP / dt = 0.15*P - 0.0002*P^2

Factor out 0.15*P:

dP / dt = 0.15*P ( 1 - P/750)

- Hence, our constants are:

r = 0.15 , K = 750

- We will set up and inequality for what values of P is dP/dt > 0 and dP/dt <0

dP / dt = 0.15*P - 0.0002*P^2 < 0

= Solve for P:

P < 0 , 1-P/750 = 0 -----> P > 750

So when when P is decreasing the intervals are:

( - inf , 0 ) & ( 750 , inf )

And when P is increasing the intervals are:

( 0 , 750)

6 0

3 years ago

You must select a team from a group of 6 boys and 10 girls. How many ways can you select 2 boys and 5 girls?

Keith_Richards [23]

Using the combination formula, it is found that you can select 2 boys and 5 girls in 2,520 ways.

In this problem, Joao and Elisa would be the same team as Elisa and Joao, hence the order is not important and the <em>combination formula</em> is used to solve this question.

<h3>What is the combination formula?</h3>

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by:

$C_{n,x} = \frac{n!}{x!(n-x)!}$

In this problem:

2 boys are selected from a set of 6.

5 girls are selected from a set of 10.

Hence:

$T = C_{5,2}C_{10,5} = \frac{5!}{3!2!} \times \frac{10!}{5!5!} = 2520$

You can select 2 boys and 5 girls in 2,520 ways.

More can be learned about the combination formula at brainly.com/question/25821700

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6 0

2 years ago

I need help with the bottom section b

d1i1m1o1n [39]

Answer:

Interior Angle Theorem

x=5

measure of angles: 46, 46, 134

Step-by-step explanation:

Interior angle theorem

12x-14=5x+21

7x=35

x=5

12x-14=12(5)-14=46

5x+21=5(5)+21=46

20x+34=20(5)+34=134

4 0

3 years ago

Jonah drew two squares with the same dimension. He then added 2 inches to the length of one square to make it a rectangle. He al

Lubov Fominskaja [6]

Answer:

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P = 2 ( l + 2 ) + 2 w

P = 4 + 2 l + 2 w

Perimeter of rectangle added 2 to width:

P = l + w + l + w

p = l + ( w + 2) + l + ( w + 2)

p = 2 l + 2 ( w + 2)

p = 2 l + 2 w + 4

5 0

4 years ago