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
Mars2501 [29]
2 years ago
8

When the sum of 7 and three times a positive number is subtracted from the square of the​ number, 0 results. find the number?

Mathematics
1 answer:
schepotkina [342]2 years ago
3 0
<span>The answer is...
x^2 - (7 + 2x) = 0
x^2 - 2x - 7 = 0</span>
You might be interested in
Can you help me i Don’t understand
snow_tiger [21]

Answer:

  A.  {-1, 2, 7}

Step-by-step explanation:

For a set of ordered pairs, the domain is the set of first-numbers (x). The range is the set of second numbers (y, or g(x)).

The first step here is to find the g(x) values for each of the listed x-values.

The attachment shows a table.

Often, we like to list the domain and/or range values in numerical order, eliminating any duplicates. That is, the set of range values {2, -1, -1, 7} would be listed as ...

  {-1, 2, 7} . . . . . . matches choice A

_____

You find the g(x) values by substituting for x and doing the arithmetic.

  g(-2) = (-2)² -2 = 4 -2 = 2, for example

7 0
2 years ago
Molly earned $160 for walking her neighbors dog. If she walked the dog five hours each week for eight weeks how much did she mak
hichkok12 [17]

$4 an hour


5 hours per week times 8 weeks is 40 hours


$160 divided by 40 hours is $4/hr.

7 0
3 years ago
Read 2 more answers
Whats the answer to 8p squared minus 16 p=10
goblinko [34]
8p² - 16p = 10

8p² - 16p - 10 = 0      Divide through by 2

4p² - 8p - 5 = 0

Multiply first and last coefficients:  4*-5 = -20

We look for two numbers that multiply to give -20, and add to give -8

Those two numbers are 2 and -10.

Check:   2*-10 = -20         2 + -10 = -8

We replace the middle term of -8p in the quadratic expression with 2p -10p


 4p² - 8p - 5 = 0     

4p² + 2p - 10p - 5 = 0     

2p(2p + 1) - 5(2p + 1) = 0

(2p + 1)(2p - 5) = 0

2p + 1 = 0    or   2p + 5 = 0

2p = 0 -1              2p = 0 - 5

2p = -1                    2p = -5

p = -1/2                    p = -5/2

The solutions are p = -1/2  or  -5/2
7 0
3 years ago
Read 2 more answers
MCR3U1 Culminating 2021.pdf
11111nata11111 [884]

Answer:

(a) y = 350,000 \times (1 + 0.07132)^t

(b) (i) The population after 8 hours is 607,325

(ii) The population after 24 hours is 1,828,643

(c) The rate of increase of the population as a percentage per hour is 7.132%

(d) The doubling time of the population is approximately, 10.06 hours

Step-by-step explanation:

(a) The initial population of the bacteria, y₁ = a = 350,000

The time the colony grows, t = 12 hours

The final population of bacteria in the colony, y₂ = 800,000

The exponential growth model, can be written as follows;

y = a \cdot (1 + r)^t

Plugging in the values, we get;

800,000 = 350,000 \times (1 + r)^{12}

Therefore;

(1 + r)¹² = 800,000/350,000 = 16/7

12·㏑(1 + r) = ㏑(16/7)

㏑(1 + r) = (㏑(16/7))/12

r = e^((㏑(16/7))/12) - 1 ≈ 0.07132

The  model is therefore;

y = 350,000 \times (1 + 0.07132)^t

(b) (i) The population after 8 hours is given as follows;

y = 350,000 × (1 + 0.07132)⁸ ≈ 607,325.82

By rounding down, we have;

The population after 8 hours, y = 607,325

(ii) The population after 24 hours is given as follows;

y = 350,000 × (1 + 0.07132)²⁴ ≈ 1,828,643.92571

By rounding down, we have;

The population after 24 hours, y = 1,828,643

(c) The rate of increase of the population as a percentage per hour =  r × 100

∴   The rate of increase of the population as a percentage = 0.07132 × 100 = 7.132%

(d) The doubling time of the population is the time it takes the population to double, which is given as follows;

Initial population = y

Final population = 2·y

The doubling time of the population is therefore;

2 \cdot y = y \times (1 + 0.07132)^t

Therefore, we have;

2·y/y =2 = (1 + 0.07132)^t

t = ln2/(ln(1 + 0.07132)) ≈ 10.06

The doubling time of the population is approximately, 10.06 hours.

8 0
2 years ago
A cookie recipe calls or 3/4?cups of chocolate chips. You only want to make 2/3 as many cookies as the recipe makes. How many cu
Leni [432]
Less than 1 cup of chocolate chips
6 0
3 years ago
Read 2 more answers
Other questions:
  • Yvonne is thinking of a number. fifty, decreased by three times the the number, is the same as seven times the number, increased
    6·1 answer
  • Chose all of the terms that describe the set of lines.
    15·1 answer
  • A verandah of width 2.25 m is constructed all long outside a room which is 5.5 m long and 4m wide. Find the area of the verandah
    13·1 answer
  • Find an equation of the sphere with center s23, 2, 5d and radius 4. What is the intersection of this sphere with the yz-plane?
    5·1 answer
  • Which of the following expressions is in simplified form?
    7·1 answer
  • HELP PLEASE ASAP!!!! 20 POINTS!!!!
    14·1 answer
  • chris and molly wins $2400 in a competition they share the money in the ratio2:3 how much money do they each receive ?​
    9·1 answer
  • 35% of what number is 91?<br> I need step by step too
    8·2 answers
  • Which angles are vertical angles
    10·2 answers
  • PREGUNTA 3PRODUCCION Y COSTOS DE UNA EMPRESA ………………. (04 PUNTOS)SEA q = f ( T / K ) .................... q = PRODUCTO TOTAL FISI
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!