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3 years ago

I just don’t understand this please help its for accuracy and it’ll be 50 points pleaseee

Mathematics

2 answers:

alisha [4.7K]3 years ago

7 0

Answer:

Hey can anyone help me with my question?

Step-by-step explanation:

PLeAsE its really easy, im in grade 7. I need help with this math question and my teacher didn't tell me the formula.

Yuki888 [10]3 years ago

5 0

I’ll do the first one for you to give you an example. It is super simple so I think you’ll catch on quickly.

So as it’s written, y=2x-1

For a line to be parallel, it has to have the same slope.

You would change the variables to the coordinates which is -2=2*-2+b

Your y-intercept (the b) is what changes

-2=2*-2+b
-2=-4+b
2=b

The answer is y=2x+2

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Two spheres M and N have volumes of 500 cubic cm and 9500 cubic cm respectively. Find the ratio of their radii.

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Answer:

4.9:13.1

Step-by-step explanation:

V=4/3*pi*r^3

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3 years ago

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Step-by-step explanation:

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2 years ago

4, 5, 3, 3, 1, 2, 3, 2, 4, 8, 2, 4, 4, 5, 2, 3, 6,2

Anna007 [38]

Answer:

Given data:

4, 5, 3, 3, 1, 2, 3, 2, 4, 8, 2, 4, 4, 5, 2, 3, 6,2

Put the data in the ascending order:

1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6, 8

Mean, the average:

(1 + 2*5 + 3*4 + 4*4 + 5*2 + 6 + 8)/18 = 3.5

Median, average of middle two numbers:

Mode, the most repeated number:

2 (repeated 5 times)

Mean is normally the best measure of central tendency, same applies to this data.

6 0

2 years ago

Read 2 more answers

A young child throw a ball upwards with an initial velocity of 20 feet/second. The height of the ball (in feets) after t seconds

Levart [38]

If this is a parabolic motion equation, then it is a negative parabola, which looks like a hill (instead of a positive parabola that opens like a cup). Your equation would be h(t)= -16t^2 + 20t +3. That's the equation for an initial velocity of 20 ft/s thrown from an initial height of 3 ft. And the -16t^2 is the antiderivative of the gravitational pull. Anyway, if you're looking for the maximum height and you don't know calculus, then you have to complete the square to get this into vertex form. The vertex will be the highest point on the graph, which is consequently also the max height of the ball. When you do this, you get a vertex of (5/8, 9.25). The 9.25 is the max height of the ball.

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3 years ago

The number of customers waiting for gift-wrap service at a department store is an rv X with possible values 0, 1, 2, 3, 4 and co

julia-pushkina [17]

Answer:

P[X=3,Y=3] = 0.0416

Step-by-step explanation:

Solution:

- X is the RV denoting the no. of customers in line.

- Y is the sum of Customers C.

- Where no. of Customers C's to be summed is equal to the X value.

- Since both events are independent we have:

P[X=3,Y=3] = P[X=3]*P[Y=3/X=3]

P[X=3].P[Y=3/X=3] = P[X=3]*P[C1+C2+C3=3/X=3]

P[X=3]*P[C1+C2+C3=3/X=3] = P[X=3]*P[C1=1,C2=1,C3=1]

P[X=3]*P[C1=1,C2=1,C3=1] = P[X=3]*(P[C=1]^3)

- Thus, we have:

P[X=3,Y=3] = P[X=3]*(P[C=1]^3) = 0.25*(0.55)^3

P[X=3,Y=3] = 0.0416

6 0

3 years ago