help with khan academy

Answer:

17 in.

Step-by-step explanation:

Some of the pizza will be ate multiply by 4 to get 17

Answer:

144.5 or 144 1/2

Step-by-step explanation:

Rectangle:

Length times width = area

13(9) =

117

Triangle:

1/2 times base times height = area

1/2(11)(5) =

27.5 or 27 1/2

Total area: 144.5 or 144 1/2

Answer:

i. Math: 225; English: 195

ii. 402

iii. 420

Step-by-step explanation:

Step-by-step explanation:

the speed of the first ship is 20 mph

and the second ship is 15 mph

The speed of the ship that travelled North is 20 miles per hour and that of the ship that travelled East is 15 miles per hour.

Constant Speed:

'When the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed.'

According to the given problem,

Let the pirate ship that travelled north be A and the other ship that travelled east be B.

Since ship A went North which is upwards and ship B went east which is towards the right,

We can construct a right angled triangle with the perpendicular being the distance travelled by ship A and the base being the distance travelled by ship B.

It is given that after travelling for one hour, the ships are 25 miles apart.

Therefore we can consider the hypotenuse of the triangle to be 25 miles.

Now applying pythagoras theorem,

   Hypotenuse² = Perpendicular² + Base²

⇒ 25² = x² + ( x + 5 )²

⇒ 625 = x² + x² + 10x + 25

⇒ 2x² + 10x + 25 - 625 = 0

⇒ 2x² + 10x - 600 = 0

⇒ x² + 5x - 300 = 0

⇒ x² + 20x - 15x - 300 = 0

⇒ x( x + 20 ) - 15( x + 20) = 0

⇒ ( x + 20 )( x - 15 ) = 0

⇒ x = 15 , -20

Since, distance cannot be negative,

x = 15

Therefore Distance travelled by ship A = ( 15 + 5 ) miles

                                                                 = 20 miles

Time taken = 1 hour

Speed of ship A = [tex]\frac{Distance}{Time}[/tex]

                           = [tex]\frac{20}{1}[/tex] miles per hour

Distance travelled by ship B = 15 miles

Speed of ship B = [tex]\frac{15}{1}[/tex] miles per hour

Hence, after solving the problem, we can conclude that the speed of the ship travelling north is 20 miles per hour and the ship travelling east is 15 miles per hour.

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Answer:

-8x+y=20

y=20+8x

-5x-y=6

-5x-(20+8x)=6

-5x-20-8x=6

-13x=6+20

-13x=26

-13x÷ -13=26÷ -13

x= -2

-8x+y=20

-8×(-2)+y=20

16+y=20

y=20-16

y=4

A) (-2,4)

Answer:

$2.15; $2.83

Step-by-step explanation:

2.7 + 1.75 = $2.83

$2.83 is the answer

Answer:

D

Step-by-step explanation:

The system of linear equation 25.75x + 4.25y = 150 represents x and y as the number of backpacks and the number of notebooks.

In a system of the linear equation there exist if and only if the number of unknowns and the number of the equation is equal.

Total item purchased = 10

The cost of backpacks = $25.75

The cost of notebooks = $4.25

The total cost of the items is $150.

Let x be the number of backpacks and y be the number of notebooks so, the system of equations.

25.75x + 4.25y = 150

Therefore, the system of linear equation 25.75x + 4.25y = 150 represents x and y as the number of backpacks and the number of notebooks.

Learn more about linear equations;

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Answer: 1.35, 2.5, 1.8

Step-by-step explanation:

Answer:

Step-by-step explanation:

1) 2.5^=97.6

2) 1.8^5= 18.8

3) 1.35^5=4.4

or

1) 2.50

2) 1.80

3) 1.35

Answer: Associative property

Step-by-step explanation: it is the same equation but they switched the numbers around on the other side of the equal sign so therefore its associative property

Answer:

Distributive property of multiplication

Step-by-step explanation:

Answer:

B, D, E

Step-by-step explanation:

Sorry I'm late, but the person above me is correct, I'm just putting the answers as the letters to make life easier. :D

Answer:

1) I and III

Step-by-step explanation:

The equation of an exponential function is given by:

y = abˣ

where x is an independent variable, y is a dependent variable, a is the initial value of y (that is value of y at x = 0), b is greater than 1 for an exponential growth while b < 1 for an exponential decay.

Given that x represent years and P(x) represent population. 2013 is represented by x= 0, hence:

At the year 2013 (x = 0), the population is 3810, hence a = 3810.

The equation becomes:

P(x) = 3810(b)ˣ

At 2014 (x = 1), the population is 3943. Hence:

3943 = 3810(b)¹

3810b = 3943

b = 1.035.

Therefore a = 3810, b = 1.035. The correct option is 1) I and III

Since b > 1, this is an exponential growth.

Answer:

2

Step-by-step explanation:

Answer:

Length of AC = 23.75 unit

Step-by-step explanation:

Give that BD II CE

Length of AB = 10 unit

Length of AD = 16 unit

Length of DE = 22 unit

Find:

Length of AC

Computation:

Give that BD II CE

So,

AB / BC = AD / DE

AB / [AC - 10] = AD / DE

10 / [AC - 10] = 16 / 22

[10][22] = [AC - 10][16]

220 = 16AC - 160

16AC = 220 + 160

16AC = 380

AC = 23.75

Length of AC = 23.75 unit

Answer:

4

Step-by-step explanation:

Pelican Beach has a median temperature above 80 degrees and the smallest interquartile range.

'A boxplot is a standardized way of displaying the distribution of data based on a five number summary, minimum, first quartile, median, third quartile, and maximum. It can tell us about the outliers and what their values are.'

According to the given problem,

In the given box plots, Whispering Palms and Pelican Beach has a median temperature of above 80 degrees. The median is the middle-most line that divides the box plot into two parts. Their median is approximately 85 degrees.

The interquartile range is the difference between the end points of the box plot.

Pelican Beach has the smallest interquartile range since the difference between the end points is less than the interquartile range of Whispering Palms.

Hence, we can conclude, Pelican Beach ahs the median temperature above 80 degrees and the smallest interquartile range.

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Answer:

Theyre all correct

Step-by-step explanation:

Answer:

the answer is cone.

Step-by-step explanation:

a p ex

Answer:

[tex]g(x) = |x-5|-4[/tex]

Step-by-step explanation:

[tex]f(x) = |x|\\\\g(x) = f(x-5)-4\\\\g(x) = |x-5|-4[/tex]

Answer:

The answer is 22!!!!!!!

Answer:

22

Step-by-step explanation:

d – f

Let d = 7 and f = -15

7 - -15

7+15

22

Answer:

The total cost would be $208

Step-by-step explanation:

First, we have to find the area of the square office which would be 4yards times 4yards which equals 16yd^2

Next, we'll multiply the area of the square office by $13 (since each square yard of new carpet costs that much).

So 16yd^2 times $13= $208

Hope I helped :)

A has both 6 and -6 as a answer

Answer:

C. 16 cm

Step-by-step explanation:

Top side: 2 + 4 = 6

Right side: 1 + 1 = 2

Bottom: 2 + 4 = 6

Left side:  1 + 1 = 2

6+6+2+2 = 16 cm.

Answer:

option A

Step-by-step explanation:

Answer:

A

Step-by-step explanation:

y = 1/4 × x - 2

x=8 => y=0. correct for B

x=12 => y= 1. correct for C

all other answer options fail for these 2 points.

Answer:

The area of the sector of the circle is approximately

Step-by-step explanation:

The given parameters of the circle having a shaded sector are;

The radius of the circle, r = 4 meters

The measure of the arc bounding the sector = 135°

The area of a sector of a circle, 'A', is given as follows;

[tex]A = \dfrac{\theta}{360 ^{\circ}} \times \pi \times r^2[/tex]

Therefore, the area, 'A' of the given sector of the circle, is given as follows;

[tex]A = \dfrac{135 ^{\circ}}{360 ^{\circ}} \times \pi \times (4\ cm)^2 \approx 18.85 \ cm^2[/tex]

The area of the sector of the circle, with radius 4 cm and bounded by an arc, A ≈ 18.82 cm².

Answer:

55......................

Answer:

23, 48, 49, 55, 57, 63, 72

after arranging in ascending (or descending) we see the middle term and in this case, 55 is the middle number of the data and hence,

55 is the median

Hope this helps! have a great day ahead! :D

Answer:

yes it's a right angle triangle

Step-by-step explanation:

by using Pythagoras theorem

H2= b2 + p2

5^2= 3^2+ 4^2

25= 25

hope it helps

Answer:

The answer is A

Step-by-step explanation:

Just trust me the answer is A lol.

Answer:

Step-by-step explanation:

The roots of the quadratic equation below using the quadratic formula are option A. [-9 ± √105 ] / 6.

Given is a quadratic equation,

3x² + 9x - 2 = 0

Quadratic formula to find the roots of a general quadratic equation ax² + bx + c is,

x = [-b ± [tex]\sqrt{b^2-4ac}[/tex] ] / 2a

Here a = 3, b = 9 and c = -2.

Substituting the values,

x = [-9 ± [tex]\sqrt{9^2-(4)(3)(-2)}[/tex] ] / (2 × 3)

  = [-9 ± [tex]\sqrt{81+24}[/tex] ] / 6

  =  [-9 ± √105 ] / 6

So the roots are [-9 ± √105 ] / 6.

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Step-by-step explanation:

x-5x-6=0

x-5x=6+0

4x=6

x=6

4

x=3

2