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ohaa [14]
3 years ago
8

Linear equation 4.5 + 1.5y=24 x-y=4

Mathematics
1 answer:
WARRIOR [948]3 years ago
8 0
4.5x + 1.5y = 24 ⇒ 4.5x + 1.5y = 24
1.0x -  1.0y = 4   ⇒<u> 4.5x - 4.5y = 18</u>
                                             <u>6y</u> = <u>6</u>
                                              6     6
                                               y = 1
                             4.5x + 1.5(1) = 24
                                 4.5x + 1.5 = 24
                                 <u>         - 1.5    - 1.5</u>
                                          <u>4.5x</u> = <u>22.5</u>
                                           4.5      4.5
                                               x = 5
                                          (x, y) = (5, 1)
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For a segment of a radio show a disc jockey can play 10 records. If there are 12 records to select from in how many ways can the
sveta [45]

Answer:

<h2>66 different ways </h2>

Step-by-step explanation:

This is a combination question. Combination has to do with selection. For example if r objects are to be selected from n pool of oblects, this can be done in nCr number of ways.

nCr = n!/(n-r)r!

According to the question, if a radio show can only play 10 records out of 12 records available, this can be done in 12C10 number of ways.

12C10 = 12!/(12-10)!10!

= 12!/2!10!

= 12*11*10!/2*10!

= 12*11/2

= 6*11

= 66 different ways

7 0
3 years ago
Expand &amp; simplify:<br> (x - 1 )(x - 1)
andrey2020 [161]

Answer:

x^2 -2x+1

Step-by-step explanation:

(x - 1 )(x - 1)

FOIL

first: x*x = x^2

Outer: -1x

inner: -1x

Last: -1*-1 = 1

Add these together

x^2 -1x-1x+1

x^2 -2x+1

5 0
3 years ago
Read 2 more answers
The population of Townville in 1860 was 1500 people. The population grew at about a rate of 2.8% per year until 1960. What was t
antoniya [11.8K]

It reachs 5800 population in 1960 if i am not wrong. i'll check this out tomorrow right now i do not have enough time for it.

3 0
3 years ago
Adding &amp;subtracting x-60=20
Alex777 [14]
Just add to find X
20 + 60 = 80
-------------------------------------
X = 80
To make sure plug it in
80 - 60 = 20
The equation is true
-----------------------------------------------
x = 80 is your answer
3 0
2 years ago
Evaluate the expression (-6) squared
fiasKO [112]

\huge \boxed{\mathfrak{Question} \downarrow}

  • Evaluate the expression ⇨ (-6) squared.

\large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}

\sf (-6)  \: squared

This will be equal to..

\sf( - 6 ) ^ { 2 }

Multiply -6 by itself (squaring a number means to multiply the number by itself twice)

\sf- 6 \times  - 6  \\

-6 multiplied by-6 will get you 36 as the answer.

=    \boxed{\boxed{\bf \: 36}}

7 0
3 years ago
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