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DiKsa [7]
3 years ago
5

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
1 answer:
r-ruslan [8.4K]3 years ago
3 0

Let x + 15 = total penguins

15/ (x +15) = .30

15 = .30x + 4.5

.30x  = 10.5

x = 35

Total penguins = 15 + 35 = 50

Double Check

15 / 50 * 100 = 30%  Correct!!!


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A race track is made up of a rectangle shape 750 m by 500 m semi circles at each end. Marisol drives the track once at average s
Mkey [24]

Answer:

d=3071m

Step-by-step explanation:

From the question we are told that:

Dimension Of rectangle

Length l=750m

Breath b=500m

Velocity v=140kmh

Generally the equation for distance travel by Marsol once round the Circle is is mathematically given by

 d=2(l)+2(arc\ of\ the\ semi\ circle)

 d=2(l)+2( 2\pi r (\frac{\theta}{360}))

Where

 r=\frac{b}{2}

 r=\frac{500}{2}=>250

And

 \theta=180

Therefore

 d=2(750)+2( 2\pi 250 (\frac{180}{360}))

 d=3071m

5 0
3 years ago
Theo started to solve the quadratic equation (x+2)2 - 9 = -5
Yuliya22 [10]

Answer:2x−5=−5

Add 5

to both sides of the equation.

2x=−5+5

Add −5

and 5

.

2x=0

Divide each term by 2

and simplify.

Divide each term in 2x=0

by 2

.

2x2=02

Cancel the common factor of 2

.

Cancel the common factor.

2

x2=02

Step-by-step explanation:

Apply the distributive property.

x⋅2+2⋅2−9=−5

Move 2

to the left of x

.

2⋅x+2⋅2−9=−5

Multiply 2

by 2

.

2x+4−9=−5

Subtract 9

from 4

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3 0
3 years ago
Why don't linear equations have extraneous solutions
Scrat [10]
Linear equations do have extraneous solutions
8 0
4 years ago
Solve the system of equations.<br> 5y - 4x = -7<br> 2y + 4x = 14<br><br><br> X =<br> Y =
nadezda [96]

Answer:

5y + 2y - 4x + 4x = -7 +14

7y = 7

y = 1

2(1) + 4x = 14

4x = 12

x = 3

Step-by-step explanation:

Using the process of elimination

Add both equations. The 4x will be eliminated since one is positive and one is negative. The equation is left with only the y variable and the constant.

When y is found, input it into the second equation to find x.

8 0
3 years ago
Last one for this topic\
Eddi Din [679]

Answer:

no

Step-by-step explanation:

because if you do the math if you do 215 x 48 in doesn't reach to 12000 at all.

8 0
3 years ago
Read 2 more answers
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