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e-lub [12.9K]
3 years ago
15

20% of the cells in an organism for dyed purple there for 15 purple cells how many cells are there in all

Mathematics
1 answer:
EastWind [94]3 years ago
7 0

Answer:

75

Step-by-step explanation:

convert percent to decimal

20% = 0.20

15 / 0.20 = 75

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Expand and simplify bracket please quickly
natulia [17]

Answer:

4y²-1/4 is the required answer

Step-by-step explanation:

(2y -  \frac{1 }{2} )(2y +  \frac{1}{2} ) \\ using \: formula \:  {x}^{2}  - y {}^{2}  = (x - y)(x + y) \\ 4y {}^{2}  -  \frac{1}{4}

4 0
2 years ago
An opera singer teaches singing classes to teens. She teaches 96 teens in all. One-third of her
STatiana [176]

Answer:

32

Step-by-step explanation:

1/3x96= 31.999

4 0
3 years ago
Read 2 more answers
1. A right triangle is shown below. Use the Pythagorean Theorem to determine the lengths of each side. Phythagorean Theorem: a2
erik [133]
This may not be very pretty.
(2x + 5) * (2x + 5) expanded is (use foil)
F = 4x^2
O = 2x * 5 = 10x
I = 2x + 5 = 10x
L = 25
Total = 4x^2 + 20x + 25

(x + 3)(x + 3) = x^2 + 6x + 9 by the same method

 (2x + 7)(2x + 7) = 4x^2 + 28x + 49 Same method.

4x^2 + 20x + 25 + x^2 + 6x + 9 = 4x^2 + 28x + 49
5x^2 + 26x + 34 = 4x^2 + 28x + 49 Collect everything on the left.
x^2 - 2x - 15 = 0
(x - 5)(x + 3) = 0
x + 3 will have no meaning.
x - 5 = 0
x = 5

2x + 5 = 2*5 + 5 = 15
x + 3 = 5 + 3 = 8
2x+ 7 = 2*5 +7 = 17

Check
15^2 + 8^2 = 17^2
225 + 64 = ? 289
289 = 289

a = 15 <<<<< answer
b = 8 <<<<< answer
c = 17 <<<<< answer
 


5 0
3 years ago
Liz needs to keep no less than $500 in her checking account to avoid fees. She had $524.75 before writing a check for $65.99. Ho
geniusboy [140]

Answer: $41.24

Step-by-step explanation: In order to figure out how much she is away from 500 we need to first subtract the 65.99.

524.75 - 65.99 = 458.76

Then find the difference from 500 by subtracting again.

500 - 458.76 = 41.24

41.24 is the amount she needs to deposit in order to avoid a fee.

8 0
3 years ago
Solve for y 3x+y=9 Chapter 5 cumulative review
Firdavs [7]

Answer:

y=-3x+9

Step-by-step explanation:

Just subtract -3x on both sides

8 0
2 years ago
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