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Neko [114]
3 years ago
15

At the market, 5 light bulbs cost $9. How much do 7 light bulbs cost?

Mathematics
2 answers:
Naddik [55]3 years ago
8 0

Answer:

\boxed{$12.60}\boxed{12.60}

Step-by-step explanation:

<em>Hey there!</em>

<u>                                                               Given                                                        </u>

5 light bulbs = $9

__________________________________________________________

9 ÷ 5 = 1.8

Each light bulb is 1.8

To check do 1.8 • 5 = 9

Now we have cost per light bulb, do

7 • 1.8

= <u>$12.6 for 7 light bulbs</u>

<em>Hope this helps :)</em>

lidiya [134]3 years ago
3 0

Answer:

$12.60

Step-by-step explanation:

find unit price first

9÷5

1.8×7

12.6

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Answer:

Okay the question is not full.

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2 years ago
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A square piece of paper has an area of x2 square units. A
Dmitry_Shevchenko [17]

Answer:

Length of rectangular strip = 12

area of rectangular strip =   2*12 = 24

Area of square =  x^2 = 12^2 = 144

Step-by-step explanation:

Area of square x^2

area of rectangle is given by length * width

Length of rectangular strip = x

width of rectangular strip = 2

area of rectangular strip =  length * width = 2*x = 2x

Area of square piece of paper when  rectangular strip is taken away from it

= Area of square - area of rectangular strip

= x^2 -2x

It is given that Area of square piece of paper when  rectangular strip is taken away from it is 120 square units.

Thus,

x^2 -2x = 120\\=> x^2 -2x -120 = 0\\=> x^2 -12x +10x-120\\=> x(x-12) +10(x-12)\\=> (x+10)(x-12) = 0\\\\

Thus,

either x+10 = 0 or x -12= 0

x = -10 or x = 12

but length cannot  be negative hence neglecting x = -10

hence value of x is 12.

Hence,

Length of rectangular strip = 12

area of rectangular strip =   2*12 = 24

Area of square =  x^2 = 12^2 = 144

5 0
3 years ago
Lance has 1/2 of a pack of pencils in his desk and 1/3 of a pack of pencils in his backpack. How many packs of pencils does he h
slega [8]

Answer:

5/6 because 1/2 plus 1/3 is 5/6, meaning that B is the correct answer.

Hope this helps!

5 0
2 years ago
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Use a graphing calculator to find the value of the correlation coefficient r and determine if there is a strong correlation amon
alekssr [168]

Using a calculator, the correlation coefficient is of 0.7649. Since the correlation is greater than 0.6, there is strong correlation.

<h3>What is a correlation coefficient?</h3>

  • It is an index that measures correlation between two variables, assuming values between -1 and 1.
  • If it is positive, the relation is positive, that is, they are direct proportional. If it is negative, they are inverse proportional.
  • If the absolute value of the correlation coefficient is greater than 0.6, the relationship is strong.

Using a calculator, we insert the points (x,y) to find the coefficient. In this problem, the points are given as follows:

(1, 5), (4, 8), (8, 3), (13, 10), (19, 13)

The coefficient is of 0.7649. Since the correlation is greater than 0.6, there is strong correlation.

More can be learned about correlation coefficients at brainly.com/question/25815006

#SPJ1

6 0
2 years ago
2(3²+4²)=? <br><br><br><br><br> WHATS THE ANSWER
yulyashka [42]

Answer:

50

Step-by-step explanation:

P- Parenthesis

E- Exponents

M- Multiplication

D- Division

A- Addition

S- Subtraction

(3²+4²)

3*3= 9     4*4= 16     16+9= 25      2(25)      25*2= 50

Hope this helped! (ノ◕ヮ◕)ノ*:・゚✧

( ゚д゚)つ Bye

7 0
3 years ago
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