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3 years ago

How do I simplify the expression -(-7y+12)

Mathematics

2 answers:

True [87]3 years ago

7 0

-(7y+12)
-1(7y+12)
-7y-12

ivann1987 [24]3 years ago

3 0

The answer is -12y i think in my opinion

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The distance AB rounded to the nearest tenth =

Whitepunk [10]

it gives you the formula, so all you have to do is plug in the coordinates

$d = \sqrt{ {( - 1 + 3)}^{2} + {( - 1 - 1)}^{2} } \\ d = \sqrt{ {(2)}^{2} + {( - 2)}^{2} } \\ d = \sqrt{ 4 + 4 } \\ d = \sqrt{8} \\ d = 2 \sqrt{3} = 3.4641... \\ \\ d = 3.5$

4 0

4 years ago

If the order of selection is considered relevant, in how many ways can k objects be selected from a set of n objects?

Hoochie [10]

hi,

You have to use a formula which is known as of binomial coefficient which is :

k among n is : C ( n /k) = n! / k! ( n-k)!

! = factorial

ex : 5 object among 8 is : C ( 8/5 ) = 8 ! / 5! * ( 8-5) !

As 8! = 8*7*6*5*4*3*2*1 = 40 320

As 5! = 5*4*3*2*1 = 120

as 3 ! = 3*2*1 = 6

then : 40 320 / 120 * 6

40 320 / 720 = 56

Conclusion : there is 56 way to select 5 object among 8 of them.

ps : you can also use Pascal Triangle to do such a thing.

3 0

2 years ago

X^2 = 6x + 27; COMPLETING THE SQUARE

DedPeter [7]

x^2 = 6x + 27

x^2−6x−27=0

(x−9)(x+3)=0

x=9,−3

3 0

3 years ago

Read 2 more answers

The interior angle of a triangle has measures 100°,4y+25 and 3y +20.what is the value of y?

mrs_skeptik [129]

Answer:

y=5

Step-by-step explanation:

4 0

3 years ago

Which equation is represented by the table?

MatroZZZ [7]

Answer:

$y=-|x-3|-3$

Step-by-step explanation:

The table shows values of $y$ for different values of $x$ .

Let us test each equation with the values given in the table.

Equation 1: $y=|x+3|-3$

For $x$ = 1, we get,

$y=|x+3|-3=|1+3|-3=|4|-3=4-3=1$

So, we got 1 for $y$ . But as per table, value of $y$ should be -5.

So, equation 1 is incorrect.

Equation 2: $y=-|x-3|-3$

For $x$ = 1, we get,

$y=-|x-3|-3=-|1-3|-3=-|-2|-3=-(2)-3=-5$

So, we got -5 for $y$ . It matches with the value of table.

Let us check for another value of $x$ in order to confirm.

For $x =2$ , we get,

$y=-|x-3|-3=-|2-3|-3=-|-1|-3=-(1)-3=-4$

So, we got -4 for $y$ . It matches with the value of table.

So, equation 2 is the correct answer.

We can be completely sure by checking the remaining equations too.

Equation 3: $y=|x-3|-3$

For $x$ = 1, we get,

$y=|x-3|-3=|1-3|-3=|-2|-3=2-3=-1$

So, we got -1 for $y$ . But as per table, value of $y$ should be -5.

So, equation 3 is incorrect.

Equation 4: $y=-|x+3|-3$

For $x$ = 1, we get,

$y=-|x+3|-3=-|1+3|-3=-|4|-3=-4-3=-7$

So, we got -7 for $y$ . But as per table, value of $y$ should be -5.

So, equation 4 is incorrect.

3 0

3 years ago