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4 years ago

How many protons does silicon have? 2 14 28 28.08

Mathematics

1 answer:

crimeas [40]4 years ago

8 0

Hello there.

<span>How many protons does silicon have? 2 14 28 28.08

14</span>

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Can anybody tell me why it’s “-275”? Why is it negative ? And what is the formula for finding y? And if y=b how do you find b?

Norma-Jean [14]

Answer:

275 is the amount SPENT per month for rent. Since you are decreasing that amount from your savings, it is represented with a negative sign.

The formula is: y = mx + b where

m is the rate --> -275 per month
b is the fixed rate --> 3500 savings

If you think about it logically - You have 3500 and spend $275 per month

1st month: 3500 - 275 = 3225

2nd month: 3225 - 275 = 2950

3rd month: 2950 - 275 = 2675

4th month: 2675 - 275 = 2400

5th month: 2400 - 275 = 2125

6th month: 2125 - 275 = 1850

It is easier to write it as an equation where x is the number of months and y is the balance for that month.

y = -275x + 3500

To check if the point (6, 1850) is on the line, input x = 6 and y = 1850

y = -275x + 3500

1850 = -275(6) + 3500

1850 = -1650 + 3500

1850 = 1850

Since it makes a true statement, (6, 1850) is a point on the line.

5 0

4 years ago

An instructor who taught two sections of statistics last term, the first with 20 students and the second with 30, decided to ass

padilas [110]

Answer:

0.207 = 20.7% probability that exactly 10 of these are from the second section

Step-by-step explanation:

The students are chosen without replacement, which means that the hypergeometric distribution is used.

Hypergeometric distribution:

The probability of x sucesses is given by the following formula:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

In which:

x is the number of sucesses.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

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

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

In this question:

20 + 30 = 50 total students, which means that $N = 50$

30 students from the second section, which means that $k = 30$

First 15 graded projects, so sample of 15, which means that $n = 15$

a. What is the probability that exactly 10 of these are from the second section

This is P(X = 10).

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 10) = h(10,50,15,30) = \frac{C_{30,10}*C_{20,5}}{C_{50,15}} = 0.207$

0.207 = 20.7% probability that exactly 10 of these are from the second section

4 0

3 years ago

What is 15% of 60? Create a model to prove your answer.

ICE Princess25 [194]

Answer:

Step-by-step explanation:

15 is 1/4 of 60, and 1/4 is 25%. So, 15 is 25% of 60.

4 0

4 years ago

Read 2 more answers

Suppose that in one day, a package delivery company received 3 phone calls from unsatisfied customers. If the package delivery c

Butoxors [25]

I believe its 1 complaint: 73 deliveries

3 0

4 years ago

For the right triangle shown, the lengths of two sides are given. Find the third side. Leave your answer in simplified, radical

KATRIN_1 [288]

The Pythagorean theorem tells you

... a² + b² = c²

... a² = c² - b² = 16² - 9² = 256-81 = 175

... a = √175 = √(25·7)

... a = 5√7

4 0

3 years ago