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topjm [15]
2 years ago
9

Help me plz plllzzzz

Mathematics
1 answer:
gavmur [86]2 years ago
7 0
Whenever you multiply by a negative number.

Hopefully that helps you a little.
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In a movie theater, the number of seats in a row is 8 greater than the total number of rows. How many rows are in the movie thea
Harman [31]

Answer:

26 rows

Step-by-step explanation:

this is like a rectangle length×width situation.

seats per row = s

number of rows = r

s × r = 884

s = r + 8

so, we can use e.g. the second equation in the first :

(r + 8) × r = 884

r² + 8r = 884

r² + 8r - 884 = 0

the general solution to such a quadratic equation is

x = (-b ± sqrt(b² - 4ac))/(2a)

in our case

x = r

a = 1

b = 8

c = -884

r = (-8 ± sqrt(8² - 4×1×-884))/(2×1) =

= (-8 ± sqrt(64 + 3536))/2 = (-8 ± sqrt(3600))/2 =

= (-8 ± 60)/2 = -4 ± 30

r1 = -4 + 30 = 26

r2 = -4 - 30 = -34

a negative number did not make any sense for the number of rows, so r = 26 is our answer.

8 0
1 year ago
6 Jenna bought n notebooks which cost 5 dollars each, and 3 pens which cost r dollars each. How much money did she spend?
lana66690 [7]
The answer should be 5n+3r
8 0
3 years ago
Which value of x makes this equation true?
sergejj [24]

Answer:

x=-5

Step-by-step explanation:

opening the bracket on the LHS, we have

-8x-40= -3x+x-7-3

-8x-40= -2x-10

collecting like terms

-8x+2x= -10+40

-6x= 30

divide both sides by -6

x= -5

6 0
3 years ago
Write one number as a fraction of another and please explain.
nadezda [96]
48 develop a fault out of the total built which is 2400 therefore
48/2400
If needs to be simplified then 1/50
8 0
2 years ago
James earns $2.20 less than twice gregs hourly wage. If james earns $16.50 per
Cerrena [4.2K]
Greg’s hourly wage is $9.35 per hour
5 0
3 years ago
Read 2 more answers
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