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3 years ago

40 points!

Mathematics

2 answers:

Georgia [21]3 years ago

8 0

Hello...

What creates the convection current inside Earth?

A. Rising and sinking of material

Dennis_Churaev [7]3 years ago

7 0

Answer: A. Rising and sinking of material.

Step-by-step explanation:

Convection currents are caused by the cooling of material as it rises up, which leads to the same material to sink. This material then warms as it sinks to rise again. This is why we call them convection currents. Because they both rise, and sink, in a circular motion we call the convection current.

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Find out how much it cost for 8 apples if they are .99 cents. Write an equation

11111nata11111 [884]

Answer:

7.92

Step-by-step explanation:

0.99*8=7.92

7 0

4 years ago

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What is the rate of change and initial value for the linear relation that includes the points shown in the table?

Wittaler [7]

Answer:

Initial value $12$ , rate of change: $-2$

Step-by-step explanation:

Step 1

Find the rate of change

we know that

In a linear equation the rate of change is equal to the slope

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

we have

$A(1,10)\ B(2,8)$

Substitute the values

$m=\frac{8-10}{2-1}$

$m=-2$ ----> rate of change

Step 2

Find the initial value

The equation of the line into slope-point form is equal to

$y-y1=m(x-x1)$

Substitute

$y-10=-2(x-1)$

$y=-2x+2+10$ $y=-2x+12$

The initial value is the value of y when the value of x is equal to zero (is the y-intercept)

$y=-2*0+12=12$ ----> initial value

7 0

3 years ago

Read 2 more answers

What is the standard deviation of a random variable q with the following probability distribution? (Do not round intermediate ca

stiks02 [169]

Answer:

The standard deviation of given probability distribution is 0.8292

Step-by-step explanation:

We are given the following in the question:

q: 0 1 2

Probability: 0.25 0.25 0.50

Formula:

$E(q) = \displaystyle\sum q_ip(q_i)\\=0(0.25) + 1(0.25) + 2(0.50) = 1.25$

$E(q^2)= \displaystyle\sum q_i^2p(q_i)\\=0^2(0.25) + 1^2(0.25) + 2^2(0.50) = 2.25$

Variance =

$\sigma^2 = E(q^2) = (E(q))^2\\= 2.25- (1.25)^2\\=0.6875\\\sigma = \sqrt{0.6875} = 0.8292$

Thus, the standard deviation of given probability distribution is 0.8292

8 0

4 years ago

Hi I'm in 4th grade and I need help. Pls

BartSMP [9]

Answer:

D) x = 13/7

Each platter will have 2 loaves.

Step-by-step explanation:

13 by 7 = 1.857...

Estimate 1.857 = 2

Hope it helps!

6 0

3 years ago

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Find the discriminant of x^2+6x+13=0. What does this number tell you about how many real solutions there are to the equation? Sh

Lana71 [14]

Discriminant = sq root of b^2 - 4*a*c =
sq root of 36 - 4*1*13 =
sq root 36 -52 =
sq root 36 -52 =
sq root -16
There are no real solutions for this equation. Both roots are complex numbers.

5 0

3 years ago

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