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Nana76 [90]
2 years ago
8

Four times the sum of a number and 15 is at least 120.let x represent the number. Find all possible values for x

Mathematics
1 answer:
jenyasd209 [6]2 years ago
5 0
4x + 15 >= 120
4x + 15 - 15 = 120 - 15
4x = 105
4x/4 = 105/4
x = 26.25
Answer is x >= 26.25
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A population of bacteria is initially 2,000. After three hours the population is 1,000.
lina2011 [118]

The population starts at 2000, so a=2000.

We also know that the population in 3 hours is 1000, so we can setup the equation:

     2000 b^3 = 1000

This gets us:

    b^3 = 1/2

And taking the cube root of both sides gives us:

    b ≈ 0.7937005259841

Rounding that to 4 places, we have:

    f(t) = 2000 (0.7937)^t

5 0
3 years ago
Sally dug a hole 5 feet deep to plant roses. She
ikadub [295]

Step-by-step explanation:

here will take the earth's surface as 0.

hence,

the first hole that Sally dug is 5 feet below the surface making its integer -5

the second hole Sally dug was 8 feet below the surface making its integer -8

therefore, the roses are closest to the surface.

8 0
2 years ago
Klara makes a salad from the salad bar at the supermarket. It cost $6.29. She pays with a $10 bill. How much change does she get
Alex

Answer:

<em>$3.71</em>

Step-by-step explanation:

You need to subtract $10.00 - $6.29


       10.00

 -      6.29

---------------

         3.71

Answer: $3.71

6 0
3 years ago
Y = x^2+5x-3<br> y-x=2<br><br> What is the solution of the linear-quadratic system of equations
Sunny_sXe [5.5K]

Answer:

(-5,-3)

(1,3)

Step-by-step explanation:

Solving with substitution

Set both equations to y =  ...

y = x^2 + 5x - 3

----------------

y - x =2

y = x + 2

----------------

Substitute one of the Y's with the other Y = equation.

x + 2 = x ^2 + 5x -3

Set one side to 0

0 = x^2 + 4x -5

x^2 + 4x - 5 = 0

Simplify by factoring

(x-1) (x+5)

Get your X values

x-1 = 0

x = 1

x+5 = 0

x = -5

Plug in each X into one of the equations to get your Y value.

1st X

y = x + 2

y = 1 + 2

y = 3

When X = 1, Y = 3

2nd X

y = x + 2

y = -5 + 2

y = -3

When X = - 5, Y = -3

Your answers are (1,3) and (-5,-3)

8 0
2 years ago
Hey can you please help posted picture of question
abruzzese [7]
Hello

The answer is C because you multiply 2 •2•2•2 and get 16 then add the negative and get -16

Hope this helps
Plz mark me as brainliest
4 0
3 years ago
Read 2 more answers
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