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anzhelika [568]
4 years ago
14

How many solutions are there to the equation n^2-13n=-40

Mathematics
2 answers:
Marizza181 [45]4 years ago
8 0
It has 2 real solutions which are 5 and 8
Nitella [24]4 years ago
4 0

Answer:

n = 5

n = 8

Step-by-step explanation:

n^2 - 13n = -40

Equate everything to zero

n^2 - 13n + 40 = 0

Factorise

(n - 5)(n - 8) = 0

Either

n - 5 = 0

Add 5 to both sides

n - 5 + 5 = 0 + 5

n = 5

Or

n - 8 = 0

Add 8 to both sides

n - 8 + 8 = 0 + 8

n = 8

n = 5 or

n = 8

It has two real solutions

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Kristen takes 2 pages of notes during each hour of class. Write an equation that shows the relationship between the time in clas
kupik [55]

Answer:

y = 2x

Step-by-step explanation:

Kristen writes 2 pages of notes per hour in class. This is the rate of change. The function can be written as a linear equation y = mx where m = 2 pages per hour.

The function is y = 2x where x is hours in class and y is the number of pages.

5 0
3 years ago
Use divisio to find all the whole number ratios equivalent to 56:24
Mama L [17]
56/8 = 7
24/8 = 3
So we have:
7:3
7 0
3 years ago
The airport security randomly selected 24 suitcases from in the security line. Of these bags, they screened 7 suitcases. Based o
ddd [48]

Answer:

42 suitcases screened = x

Step-by-step explanation:

7/24 = x/144

7(144) = 24x

1,008 = 24x

42 = x

6 0
3 years ago
O<br> Decrease 40 by ratio of 4:5
Reika [66]

A decrease in the ratio 4:5 implies that :

New quantity:Old quantity = 4:5

Let the new quantity be \bf \: x

\bf∴ x : 40 = 4:5

=  > \bf \frac{x}{40}  =  \frac{4}{5}

\bf =  > 40 \times  \frac{x}{40}  = 40 \times  \frac{4}{5}

\bf =  > x = 8 \times 4

\bf =  > x = 32

So, the new quantity is 32

4 0
3 years ago
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!
jok3333 [9.3K]

Answer:

1.-4,-1,1,6

2.by substituting the values given, we get

32-|15+8|

32-|23|

32-23=9

3.-15+7=8

4..27-(-12)=27+12=39

5.-6.05+(-2.1)

-6.05-2.1=-8.15

6.-3/4-(-2/5)

-3/4+2/5

=-7/20

7.-9(-12)

=108

8.(3.8)(-4.1)

-15.58

9.(-8x)(-2y)+(-3y)(z)

(16xy)+(-3zy)

(16xy)-(3zy)

10.by substituting the value given,we get

2.5*(-3.2)+5

-8+5

-3

so here are the answers,mark as brainliest if u find it useful

thank you

7 0
3 years ago
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