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Marianna [84]
2 years ago
10

Alan thinks of a number. He squares it, then takes away 5, next multiplies it by 4, takes away 7, divides it by 3 and finally ad

ds 6. His answer is 9. What number did Alan start with?
Mathematics
1 answer:
SashulF [63]2 years ago
5 0

Answer: \pm3

Step-by-step explanation:

[(4(x^{2} -5)-7)/3]+6=9

((4x^{2} -20)-7)/3=9-6

4x^{2} -27=3*3

4x^{2} =9+27

x^{2}=36/4=9

x=\sqrt{9} =\pm3

x = 3

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What is the midpoint?
guapka [62]

from the formula given,

M= (x1+x2)/2

x1=10

x2=-6

(x1+x2)/2= (10+(-6))/2=(10-6)/2=4/2=2

you could also make x1=-6 and x2=10

(x1+x2)/2= (-6+10)/2=4/2=2

5 0
3 years ago
Read 2 more answers
A classroom board is 54 inches wide and 36 inches tall. Eva
Lady bird [3.3K]
<h3>Answer:  180 inches</h3>

Work Shown:

L = 54 = length

W = 36 = width

P = 2(L+W) ... perimeter of the rectangle

P = 2(54+36)

P = 2(90)

P = 180

She needs 180 inches of ribbon.

To convert to feet, divide by 12. So 180 inches = 180/12 = 15 feet.

8 0
2 years ago
Write an equation of the line containing the given point and parallel to the given line.
Maksim231197 [3]

Answer:

y = (4/3)x − 10

Step-by-step explanation:

Rewrite in slope-intercept form.

The slope-intercept form is y = mx + b, where m is the slope and b is they-intercept.

y = mx + b

Subtract 4x from both sides of the equation.

−3y = 8 − 4x

Divide each term by −3 and simplify.

Divide each term in −3y = 8 − 4x by −3.

        (−3y/−3)= (8/−3) + (−4x/−3)

Cancel the common factor of −3.

         y= (8/−3) + (−4x/−3)

Simplify (8/−3) + (−4x/−3)

         y= (4x/3 - 8/3)

Reorder terms.

         y= 4x/3 - 8/3

Using the slope-intercept form, the slope is 4/3

         m = 4/3

To find an equation that is parallel, the slopes must be equal. Find the parallel line using the point-slope formula.

Use the slope 4/3 and a given point (6, −2) to substitute for  x_{1}and y_{1}in the point-slope form. y − y_{1} = m (x − x_{1}) which is derived from the slope equationm= (y_{2}− y_{1})/(x_{2} - x_{1})

y − (−2) = (4/3) ⋅ (x − (6))

Simplify the equation and keep it in point-slope form.

y − (−2) = (4/3) ⋅ (x − (6))

solve for y

y = (4/3)x − 10

5 0
3 years ago
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(8,14)
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4 years ago
How many cubic centimeters is 5 cubic meters.
tresset_1 [31]
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x = 1000000 cubic cm x 5 cubic m ÷ 1 cubic m
x = 5<span>000000 cubic cm

Hope this helps!
Feel free to message me if you have any questions :)</span>
4 0
3 years ago
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