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balu736 [363]
3 years ago
15

Which number line represents the solution set for the inequality 3x<-9

Mathematics
2 answers:
KiRa [710]3 years ago
6 0

Answer:

The graph in the attached figure

Step-by-step explanation:

we have

3x < -9

solve for x

Divide by 3 both sides

3x/3 < -9/3

x < -3

The solution is the interval------>(-infinite, -3) -

All real numbers less than -3

In a number line the solution is the shaded area to the left of the dashed line (open circle)

see the attached figure

r-ruslan [8.4K]3 years ago
3 0
The answer would be the 3rd number line or "C"
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Write the equation of the parabola with a focus (-2,4) and directrix y = 0.
Yakvenalex [24]

y=0 means sideways from the usual orientation. The definition of a parabola is equal distances of (x,y) to the focus and the directrix.  We equate squared distance:

(x + 2)² + (y - 4)² = (y - 0)²

x² + 4x + 4 + y² - 8y + 16 = y²

x² + 4x + 20 = 8y

We could divide by 8 to get y= something but let's just skip the fractions and answer

Answer: 8y = x² + 4x + 20

4 0
3 years ago
at a maximum speed, an airolane travels 1680 miles against the windin 5 hours. Flying with the wind, the plane can travel the sa
Licemer1 [7]

Answer:

Plane Speed (x) = 378 mph

Step-by-step explanation:

Equation

d = r * t

Givens

With the wind

  • d = 1680 miles
  • t = 4 hours
  • r = x + y

Against the wind

  • d = 1680
  • t = 5 hours
  • r = x - y

Equation

The distances are the same, so you can solve for x in terms of y and then deal with the actual distance.

(x + y)*4 = (x - y)*5                   Remove the brackets on both sides

Solution

  • 4x + 4y = 5x - 5y                     Subtract 4x from both sides
  • 4y = -4x + 5x - 5y                    Combine
  • 4y = x - 5y                               Add 5y to both sides                      
  • 5y + 4y = x
  • x = 9y

Solution part 2

Now take one of the distance formulas and solve for x first then y.

  • (x - y)*5 = 1680               Substitute 9y for x
  • (9y - y)*5 = 1680             Subtract on the left
  • 8y * 5 = 1680                  Multiply on the left
  • 40y = 1680                     Divide by 40
  • y = 1680/40            
  • y = 42                             That's the speed of the wind.
  • (x - y)*5 = 1680               Substitute the wind speed for y
  • (x - 42)*5 = 1680             Divide both sides by 5
  • (x - 42) = 1680 / 5            Do the division on the right
  • (x - 42) = 336                   Add 42 to both sides.
  • x = 336 + 42
  • x = 378 mph                    Plane's speed

7 0
4 years ago
The sum of the reciprocals of the first four consecutive positive integers is greater than two. What is the least number of cons
Anastaziya [24]

The least number of consecutive positive integer that is required to make the sum of the reciprocals greater than three is 7.

<h3>What is an integer?</h3>

An integer is simply a number that is not  a  fraction.

The first four consecutive positive integers are:

1, 2, 3 , 4.

Their reciprocals are:

1/1, 1/2, 1/3, 1/4; and

The sum of them are greater than 2; that is

1/1 + 1/2 + 1/3 + 1/4 = 2.08333333333 > 2

to make the expression >3

We would require the following integers

1/1 + 1/2 + 1/3 + 1/4+ (1/5) + (1/6) + (1/7) + (1/8)+ (1/9) + (1/10) + (1/11) = 3.01987734488


Thus, the additional consecutive reciprocal integers that is required to make the sum of the reciprocal of the fist four greater than 3 is 7.

Learn more about reciprocals at:
brainly.com/question/673545

#SPJ1

4 0
2 years ago
What is 0.36 expressed as a fraction in simplest form
stiv31 [10]
We know that
0.36 is equal to------> 36/100----> divided by 4 both members----> 9/25

the answer is
9/25
7 0
3 years ago
A pizza is divided into 16 slices. Elizabeth eats 1/8 of the pizza in 10 minutes. At this rate, how many slices can she eat in a
Aleks04 [339]
Let’s double the number so 1/8= 2/16
She can eat 6 slices in 1 hour and it takes her 160 minutes or 2 hours and 40 minutes to finish the entire pizza.

Hope this helps! :3
3 0
3 years ago
Read 2 more answers
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