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xenn [34]
3 years ago
8

A circle has a diameter 9cmPls help meeeeeeeeeeeeeeeeeeeeeee

Mathematics
1 answer:
Slav-nsk [51]3 years ago
7 0

Answer:

A=63.585 cm²

Step-by-step explanation:

Note : It is not given what to find so i am finding are of the circle.

D=9cm

r=D/2

r=9/2

r=4.5

Area of the circle :

A=πr²

A=π4.5²

A=63.585 cm²

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A machine produces open boxes using square sheets of metal. The machine cuts​ equal-sized squares measuring 2 inches on a side f
docker41 [41]

Answer:

width  9''    length 9''

Step-by-step explanation:

2 " is cut off from both sides

so the base of the box will be a square  

area * height = volume of box  

side = x

height =2  

2x^2=162  

x^2=81

x=9 inches  the side of the box

Volume =162

V=area*height      V= 81*2= 162

8 0
2 years ago
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A line represented by y = 2x − 3 and a line perpendicular to it intersect at R(2, 1). What is the equation of the perpendicular
neonofarm [45]

Answer:

y = -1/2x + 2

Step-by-step explanation:

y = 2x - 3. The slope here is 2. A perpendicular line will have a negative reciprocal slope. To find the negative reciprocal, just flip the slope and change the sign.

slope = 2 or 2/1.....flip it.....1/2....change the sign...-1/2. So our perpendicular line will have a slope of -1/2.

y = mx + b

slope(m) = - 1/2

(2,1)....x = 2 and y = 1

now we sub and find b, the y intercept

1 = -1/2(2) + b

1 = -1 + b

1 + 1 = b

2 = b

so ur equation is : y = -1/2x + 2 <===

and u can check it with ur points....(2,1)

y = 2x - 3

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1 = 4 - 3

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8 0
3 years ago
Question 8: Find the equation of the straight line that:
Scorpion4ik [409]

Answer:

y=4x+6

Step-by-step explanation:

Hi there!

Linear equations are typically organized in slope-intercept form: y=mx+b where m is the slope (also called the gradient) and b is the y-intercept (the value of y when x is 0)

<u>1) Plug the gradient into the equation (b)</u>

y=mx+b

We're given that the gradient of the line is 4. Plug this into y=mx+b as m:

y=4x+b

<u>2) Determine the y-intercept (b)</u>

y=4x+b

Plug in the given point (1,10) as (x,y) and solve for b

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Subtract 4 from both sides to isolate b

10-4=4+b-4\\6=b

Therefore, the y-intercept of the line is 6. Plug this back into y=4x+b as b:

y=4x+6

I hope this helps!

8 0
2 years ago
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What is an rational number
Ahat [919]
A rational number is a number that can be written into a fraction. pi, some square roots, e, etc., are irrational numbers(numbers that cannot be written into a fraction).
8 0
3 years ago
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Joel spent $28 for an Internet data service
ELEN [110]

Answer:

28+14.50+524.50+13.25=  580.25

Step-by-step explanation:

Add it all together.

5 0
3 years ago
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