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labwork [276]
3 years ago
11

Find the range of values for which x2 - 6x + 8 < 0

Mathematics
1 answer:
Alex73 [517]3 years ago
5 0

Answer:

Step-by-step explanation:

Factor

x^2-6x+8<0

(x-2)(x-4)<0

For this to be less than zero the factors must have opposite signs.

x>2 and x<4

2<x<4

So x is all real numbers between 2 and 4 or in interval notation

x=(2,4)

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How many square feet of out door carpet will we need for this hole
Vadim26 [7]
Hey! Let me help you on this one.

As you can see, this is a very complex shape, and this might confuse you at first. Don't fear, there is a very easy and fun way to solve it.

Take a closer look at the problem. Do you notice anything? It consists of few different shapes that might be much easier for you to find area of. 

For example, as you can see on the image I have sent you, these are the shapes present in the figure.

On this image, only two types of figures are present - triangle and a rectangle. Both shapes have a very easy area formula.

Triangle - S=  \frac{a*b}{2}

Rectangle - S=a*b

Using these formulas, let's find the area of this complex figure by solving for each individual shape, and then, adding everything together.

Triangle at the bottom has a side of 4 feet, and an unknown second side. We can find it by getting the difference of 12 feet and 8 feet.

Why you might ask? Well, if you look at it closer, the difference is exactly the length of the side we need.

12-8=4

Neat! It's four as well. Let's start solving for its area.

S= \frac{4*4}{2}
S=8

Area of the first triangle is 8 feet squared. Let's get into the second triangle. It's right above this one!

Length of its right side is 3 feet, and the length of the bottom side is the same as the one we found few steps back - four feet.

S= \frac{4*3}{2}
S= 6

Awesome! Area of the second triangle is 6 feet squared. Let's take a closer look at the last figure - rectangle.

S=8*3
S=24

Area of the rectangle is 24 feet squared. Done, we have all the areas of individual shapes. Let's add them together.

24+6+8=38

Answer: The area of this figure is 38 feet squared

5 0
4 years ago
A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist traveling in the same direction along the same pat
erastovalidia [21]

Answer: the cyclist must wait for 25 minutes until the hiker catches up.

Step-by-step explanation:

Distance = speed × time

The Cyclist was travelling in the same direction along the same path

as the hiker at a constant rate of 20 miles per hour. If the cyclist stops to wait for the hiker 5 minutes after passing her, then the distance that the cyclist travelled in 5 minutes(5/60 hour) is

20 × 5/60 = 100/60 miles

For the hiker to catch up with the cyclist, she would cover 100/60 miles at a speed of 4 miles per hour.

Time = distance/speed

Time required by hiker to catch up with the cyclist is

(100/60)/4 = 100/240 hour

Converting 100/240 hour to minutes, it becomes

100/240 × 60 = 25 minutes

5 0
3 years ago
The perimeter of a square is 56cm. What is the approximate length of its diagonal?
gogolik [260]

To find the answer, we can use the Pythagoras theorem, where:

\sqrt{a^{2}+ b^{2} } =c^{2}

Where a and b is the side length and c is the diagonal.

In this case:

\sqrt{56^{2} +56^{2} } \\ =\sqrt{6272} \\ =79.19596... \\ =79.2(correct to 3 sig. fig.)

Therefore, the answer is 79.2cm

Hope it helps!

6 0
3 years ago
Pls help me with 1 and 2 plzzzz
kupik [55]

Answer:

1. First choice, 1/2

2. First choice, 1/2

Step-by-step explanation:

3 odd numbers on a dice, so 3/6 = 1/2

12 numbers, 1- 12, the even numbers are 2, 4, 6, 8, 1-, and 12. 6 out of 12 = 6/12 = 1/2

7 0
3 years ago
$35.00 has a discount of 20%. What's the discount?
Jobisdone [24]
The discount would be 7.00 dollars.... i hope this helps
5 0
4 years ago
Read 2 more answers
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