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vredina [299]
3 years ago
8

A zoo has 15 emperor penguins the emperor penguins make up 30% of all the penguins at the zoo how many penguins live at the zoo?

Mathematics
2 answers:
olga_2 [115]3 years ago
8 0
I think it's 35. I was thinking like since 15×2=30 I said, 30+70=100 so 70÷2=35...
solmaris [256]3 years ago
7 0
The final answer would be 50 penguins look on amara.org
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A radioactive substance decays exponentially. A scientist begins with 190 milligrams of a radioactive
worty [1.4K]

Answer: 65.1 (mg)

Step-by-step explanation:

y=190*e^{-a*t}\\\\Calculate\ a:\\\\t=33,y=95(mg)\\\\190*e^{-a*33}=95\\\\e^{-a*33}=0.5\\\\-a*33=ln(0.5)\\\\a=\dfrac{ln(\dfrac{1}{2}) }{-33} \\\\a=0,02100... \approx{0.021}\\\\If\ t=51\ h, y=190*e^{-0.02100*51}=65.09167...\approx{65.1}

6 0
3 years ago
a contractor charges $1200 for 100 square feet of roofing installed. at this rate, how much does it cost to have 1100 square fee
Ratling [72]

Step-by-step explanation:

If it cost $1200 to install 100 square feet of roofing, then it will cost $13200 to have 1100 square feet installed.

$1200/ 100 square feet         multiply 11 on both sides

$13200/ 1100 square feet

<h3><u><em>Please mark this as brinliest thank you!!!</em></u></h3><h3><u><em>: )</em></u></h3><h3><u><em>And as always, </em></u></h3><h3><u><em>simplify bananas</em></u></h3>
8 0
3 years ago
The number of girls in cobbs class is 2 less than 3 times the number of boys. She has 26 students in her class how many are boys
Natalka [10]

Answer:

7 are boys

Step-by-step explanation:

Make a system of equations where g is for girls and b is for boys.

b+g=26

g=3b-2

Substitute "3b-2" in for "g" in the first equation.

b+(3b-2)=26

Rewrite without the parentheses because it's addition and not multiplication.

b+3b-2=26

Combine like terms.

4b-2=26

Add 2 to both sides.

4b=28

Divide by the coefficient of the variable to get it alone.

b=7

3 0
3 years ago
Evaluate 3/5r +5/8swhen r =14 and s =8
Illusion [34]

Step-by-step explanation:

14×5=70

8×8=64

(3/70) + (5/64)

= (3×64)+(5×70)

----‐------------------

70×64

= (192+350)/448

=542/448

= 271/224

5 0
3 years ago
For what value of b makes this equation true? (Solve for b)<br> b +9 = -2
neonofarm [45]

━━━━━━━☆☆━━━━━━━

▹ Answer

<em>b = -11</em>

▹ Step-by-Step Explanation

b + 9 = -2

     -9   -9

b = -2 - 9

b = -2 + -9

b = -11

Hope this helps!

- CloutAnswers ❁

Brainliest is greatly appreciated!

━━━━━━━☆☆━━━━━━━

7 0
3 years ago
Read 2 more answers
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