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Galina-37 [17]
3 years ago
7

Kendra was asked to find the number of students who planned to attend the evening sympothy performance. She was told that 40 per

cent of the 50 students planned to attend. Kendra's work is shown below.
Part 40x2 80
------- = --------- = -------
whole 100 x 2 200

What mistake did Kendra make?
A. Kendra should have multiplied by 4 instead of multiplying by 2.
B. Kendra should have divided by 2 instead of multiplying by 2.
C. Kendra should have added 40 and 50.
D. Kendra should have subtracted 40 from 50.

ILL GIVE BRAINLIEST TO THE RIGHT ANSWER!!!!!!
Mathematics
2 answers:
Paha777 [63]3 years ago
5 0

Answer:

Hey Deku it's me AnimeLover10

Step-by-step explanation:

ch4aika [34]3 years ago
4 0

Answer:

It's B

Step-by-step explanation:

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skelet666 [1.2K]

I estimate that out of 100, Jermaine is either 50% correct or 50% incorrect


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6 0
3 years ago
Assume that an average cell has a diameter of
emmasim [6.3K]

Given that the volume of a cell is 50 cubic micrometers. It says to find the number of cells present in 1 cubic centimeter.

So we need to first convert the units of volume of a cell, then we can find the total number of cells in 1 cubic centimeter.

We know 1 meter = 100 centimeters = 1000000 micrometers

So 1 centimeter = 10000 micrometers

Taking Cubic powers on both sides :-

1 cubic centimeters = 10¹² cubic micrometers

1 cubic micrometers = 10⁻¹² cubic centimeters

50 cubic micrometers = 50 × 10⁻¹² = 5 × 10⁻¹¹ cubic centimeters

So volume of one cell = 5 × 10⁻¹¹ cubic centimeters

Number of cells = \frac{Total\;\; volume}{Volume\;\; of\;\; one\;\; cell}  = \frac{1\;cm^{3}}{5 * 10^{-11}\;cm^{3}} = \frac{10^{11}}{5} = 2 × 10¹⁰ cells.

So, total number of cells = 2 × 10¹⁰ cells.

4 0
3 years ago
A grain silo has the shape of a right circular cylinder surmounted by a hemisphere. If the silo is to have a volume of 505π ft3,
Romashka-Z-Leto [24]

Answer:

radius   x  = 3 ft

height   h = 23,8  ft

Step-by-step explanation:

From problem statement

V(t)  = V(cylinder) + V(hemisphere)

let x be radius of base of cylinder (at the same time radius of the hemisphere)

and h the height of the cylinder, then:

V(c)  = π*x²*h       area of cylinder = area of base + lateral area

                                              A(c)  = π*x²  +   2*π*x*h

V(h) = (2/3)*π*x³   area of hemisphere   A(h)  =   (2/3)*π*x²

A(t)  =  π*x²  +   2*π*x*h +   (2/3)*π*x²

Now A as fuction of x    

total volume   505  = π*x²*h  +  (2/3)*π*x³

h = [505 - (2/3)* π*x³ ]  /2* π*x    

Now we have the expression for A as function of x

A(x) =  3π*x² + 2π*x*h     A(x) = 3π*x² + 505  - (2/3)π*x³

Taking derivatives both sides

A´(x) =  6πx -  2πx²              A´(x) =  0         6x  - 2x²  = 0

x₁  =  0  we dismiss

6 - 2x = 0

x = 3     and   h = [505 - (2/3)* π*x³]/2* π*x

h  =  (505 - 18.84) / 6.28*3

h  = 23,8  ft

7 0
3 years ago
What's the answer to this question 3x + 2y = -4 and how did you get it
Alex777 [14]

First you subtract 3x because you are trying to get x alone so subtract 3x on both side so you would get 2y=-3x-4 and then divide the whole thing by 2 so you would get y=-3-4/2 and then you simplify and get y=-7/2 so y=-7/2 is your answer.

6 0
3 years ago
If f(x) = x2 + 1 and g(x) = x – 4, which value is equivalent to (f circle g) (10)? 37 97 126 606
ahrayia [7]

Answer:  its 37

Step-by-step explanation:

its 37

6 0
3 years ago
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