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borishaifa [10]
3 years ago
14

7th grade easy math that I can’t do

Mathematics
2 answers:
statuscvo [17]3 years ago
5 0
The answer is D if u need an explanation lmk
zalisa [80]3 years ago
3 0

Answer: D

Step-by-step explanation: I’ve had this question b4 it’s D. I got it right.

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In Everglades National Park in Florida, there are 200 species of birds that migrate. This accounts for 2/7 of all the species of
S_A_V [24]

Answer:

A) 2/7y=200

B) There are more species of plants as the number of species of birds that have been sighted in Everglades National Park is 280

Step-by-step explanation:

Total number of species of birds that migrate = 200

We are given that  of all the species of birds are sighted in the park

a)Write an equation to find the number of species of birds that have been sighted in Everglades National Park.

Let y be the number of species of birds that have been sighted in Everglades National Park.

We are given that of all the species of birds are sighted in the park

So,   2/7y=200

y=200x7/4

y=280

B)There are 600 species of plants in Everglades National Park. Are there more species of birds or plants in the park?

So, There are more species of plants as the number of species of birds that have been sighted in Everglades National Park is 280

7 0
3 years ago
If triangle abc is similar to triangle edc find the value of x
svetoff [14.1K]

Answer:

x = 15

Step-by-step explanation:

Since the triangles are similar then the ratios of corresponding sides are equal, that is

\frac{BC}{DC} = \frac{AC}{EC} , substitute values

\frac{3x-5}{32} = \frac{5x-5}{56} ( cross- multiply )

56(3x - 5) = 32(5x - 5) ← distribute and simplify both sides

168x - 280 = 160x - 160 ( subtract 160x from both sides )

8x - 280 = - 160 ( add 280 to both sides )

8x = 120 ( divide both sides by 8 )

x = 15

4 0
3 years ago
Which of the following is a way that scientific advancements have benefited society? a. increased energy efficiency b. increased
PilotLPTM [1.2K]

The answer is a. increase energy efficiency.  This means that we now use less energy to do more thanks to many advances in technology.  It could also be due to the use of alternative sources of power such as the sun or win.  These new sources provide energy without causing pollution.

tbh google

7 0
3 years ago
I would like all the help I can’t get pleaseee
expeople1 [14]

Answer:

Step-by-step explanation:

a=4    b=12

2a+3b=

2*4+3*12=

8+36=

44

a²-b+10=

4²-12+10=

4*4-2=

16-2=

14

(ab)²-(a+b)²=

(4*12)²-(4+12)²=

48²-16²=

(48+16)(48-16)=

64*32=

2048

7 0
2 years ago
Five friends each knit one part of a scarf that is 11 yards long. 12 Which shows the fractions of the scarf each friend could ha
kotegsom [21]

Answer:

2/12 + 3/12 + 3/12 + 2/12 + 5/12

Step-by-step explanation:

I hope I'm right

3 0
3 years ago
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