1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kicyunya [14]
3 years ago
13

K(3k−6)−7k(6k+10)=12

Mathematics
2 answers:
Natalija [7]3 years ago
6 0

Answer:

k = -12/77

Step-by-step explanation:

hey

julsineya [31]3 years ago
4 0

Answer:

k = -12/77

Step-by-step explanation:

OG problem: k(3k−6)−7k(6k+10)=12

Step-by-step:

3k - 6k - 42k - 70k = 12

-3k - 42k - 70k = 12

-7k - 70k = 12

-77k = 12

k = -12/77

You might be interested in
Isabelle bought some stationery. 1/3 of them were pencils. 5/8 of the remainder were erasers and the rest were rulers. The cost
kobusy [5.1K]

Answer:

Isabelle spent $52.50 more on Erasers than rulers.

Step-by-step explanation:

Step 1

Find the quantity of each stationery bought in fraction

Let us represent the total fraction of what Isabelle bought as: x

1/3x = quantity of pencils bought

5/8 of the remainder = quantity of erasers bought

The remainder = x - 1/3x = 2/3x

5/8 of 2/3x = 5/8 × 2/3x = 5/12x

Hence, 5/12x = quantity of erasers bought

The rest is rulers

1 - (1/3 + 5/12)

1 - (4 + 5/12)

1 - 9/12

1 - 3/4

= 1/4x

Hence, 1/4 = quantity of rulers bought.

Step 2

We find the number of stationeries that Isabelle bought.

The cost of the stationery is

a Pencil: $1.20

an eraser: $1

a ruler: $0.50.

Total amount spent on stationery = 169.50

We have this equation

1.20 × 1/3x + 1 × 5/12x + 0.50 × 1/4x = 169.50

0.4x + 0.4166666667x + 0.125x =

169.50

0.9416666667x = 169.50

x = 169.50 /0.9416666667

x = 179.99999999

Approximately , the number of stationeries that Isabelle bought = x = 180

Step 3

Find the number and the amount spent on each stationery that Isabelle bought

a) i) Quantity of pencils bought = 1/3 x

x = 180

= 1/3 × 180

= 60 pencils

ii) Amount spent on pencils

If 1 pencil = $1.20

60 pencils =

60 × 1.20 = $72

b) i) Quantity of Erasers bought = 5/12x

x = 180

= 5/12 × 180

= 75 pencils

ii) Amount spent on Eraser

If 1 pencil = $1

75 pencils =

75 × 1 = $75

c) i) Quantity of rulers bought = 1/4 x

x = 180

= 1/4 × 180

= 45 pencils

ii) Amount spent on pencils

If 1 pencil = $0.50

45 pencils =

45 × 0.50 = $22.50

Step 4

We were asked to calculate how much more did she spend on erasers than rulers.

In step 3, the amount spent on Erasers = $75

the amount spent on ruler = $22.5

The difference in the amount spent = $75 - $22.5

= $52.5

Therefore, Isabelle spent $52.50 more on Erasers than rulers.

3 0
3 years ago
A bin contains 64 light bulbs of which 10 are defective. if 5 light bulbs are randomly selected from the bin with replacement, f
Sloan [31]
Total number of bulbs = 64
Number of defective bulbs = 10
Number of good bulbs = 64 - 10 = 54

P(5 good bulbs) = (54/64)⁵ = (27/32)⁵ = 0.428


Answer: 0.428
3 0
3 years ago
Need help with #8 & #14 PLEASE!!
juin [17]

Answer:

8 (see work)

14. 2x^2 -4x^2 +3

Step-by-step explanation:

There's attached work for explanation

8 0
3 years ago
Please Help
Delicious77 [7]
First you want to get h alone so you divide 2<span>π</span>r by s so your answer would be
h=S/2πr


6 0
3 years ago
Read 2 more answers
Pls help ASAP what do I put in the box (question is in screenchot)
Nat2105 [25]

Answer:

where is the question????

7 0
3 years ago
Read 2 more answers
Other questions:
  • Name two obtuse vertical angles
    13·1 answer
  • This month, Tony worked four hours more than twice the number of hours, h, he worked last month. What expression represents the
    15·1 answer
  • 1/2 x blank minus 13 equals 15
    10·1 answer
  • Can you help me find the answer please​
    13·2 answers
  • Help me asap
    5·1 answer
  • HELP ASAP WILL GIVE BRAINLIEST!! Write the equation in point-slope form for the line that contains the points
    12·1 answer
  • Choose the question that has only one possible answer.
    10·1 answer
  • Question in picture solve
    8·2 answers
  • Molly shared a spool of ribbon with 12 people. Each person received 3 feet of ribbon. Which equation can she use to find
    10·1 answer
  • Write each fraction as a percent. 2/10, /4, /20
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!