A branch of mathematics that uses variables

Answers

Answer 1

Answer: I would think that algebra is. It uses variables. Don't take my word for it, but I'm pretty sure it is that. Hope this helps ^-^

Answer 2

Answer: quadratic expressions use variables and they are a branch of math

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Amy is choosing a 2-letter password from the letters A, B, C, D, E, and F. The password cannot have the same letter repeated in it. How many such passwords are possible?

Answers

Answer:

Amy can choose from 60 possible passwords.

Solution:

Given that the two-letter password is from the letters A, B, C, D, E and F

Total number of letters = 6

The password is a two digit letter and repetition of letters is not allowed.

Method 1:

\therefore The number of ways of obtaining an ordered subset of r elements from a set of n elements is given by

$^(n) P_(r) = (n!)/((n-r)!)$

So, the total possible password = $^(6)P_(r) = (6!)/((6-4)!)$ = $(6!)/(4!)$ = $(6*5*4!)/(4!)$

On cancelling the $4!$ in numerator and denominator we get,

Here we get, $(6*5)/(1)$ = 30 possible passwords

Method 2:

There are 6 possible choices for the first term of the password and 5 choices for the second term (i.e. leaving the selected letter of the $\bold1^(st)\bold$ term)

So, $6* 5 = 30$

Answer:

Step-by-step explanation:

6 choices for the 1st, then 5 choices for the 2nd, so: 6*5=30

or nPk=n!/(n-k)! with n=6 and k=2

Put it simply each letter can be combined with 5 diffrent letters and with 6 total letters 6x5=30

Which fraction is between 0 and 2/4

Answers

2/4=1/2=0.5 _____ Between 0 and 0.5 are an infinity of fractions. Ex: 0.1 (=1/10), 0.2 (=2/10), 0.2356 (=2356/10000) etc.

one of them is 1/4 i hope this will help

a quadrilateral has all sides the same length and no right angles. what is the name of the quadrilateral

Answers

rhombus

it has 4 sides all equal and has no right angles

Hope this helps

Some one may you please help (Find the unit rate) in 1/6 hour, adam jogs 7/10 mile

Answers

10 min per 7/10 miles
1min = .07 miles

What is 1/10 of 200,000
what is 1/10 of 200000

Answers

1/10 of 200,000= 1/10 × 200,000=20,000

What number is 24% of 80

Answers

Hi

24% of 80 is 19.2

100% ⇒ 80
24% ⇒ x

100x = 24·(80)
100x = 1920
x = 1920/100
x = 19.2

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A telephone company charges a fixed monthly rate plus a rate per minute of usage. The company charges $135 for 100 minutes of usage and $375 for 500 minutes of usage. An equation can be written to show the relationship between the total minutes used (x) and the total monthly charges (y). Which of the following best describes the steps to draw the graph of y against x? Draw a graph which joins the points (135, 100) and (375, 500) and has a slope = 0.6 Draw a graph which joins the points (100, 135) and (500, 375) and has a slope = 0.6 Draw a graph which joins the points (100, 135) and (500, 375) and has a slope = 1.67 Draw a graph which joins the points (135, 100) and (375, 500) and has a slope = 1.67

Help me please this is worth 27 points!!!! I GIVE THANKS ANSWER ALL QUESTIONS TOO!!!!