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emmasim [6.3K]
3 years ago
15

Scientists estimate that about 14 million species exist, and only about 50% of them have been studied and named. About how many

species have been studying your name?
Mathematics
2 answers:
Margarita [4]3 years ago
6 0

Answer:

about 7 million

Step-by-step explanation:

50% of 14million

0.50*14000000

7000000

ra1l [238]3 years ago
5 0

Answer:

About 7 million

Step-by-step explanation: because half of 14 is 7 then add the million to it

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Yettt it’s 64 hope this helps
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Evaluate the function below for x=3<br><br> f(x)=2x^3-x^2-4x+9
elixir [45]
Hello,

f(x)=2x^3-x^2-4x+9=(((0+2)x-1)x-4)x+9

f(3)=(((0+2)*3-1)*3-4)*3+9=((2*3-1)*3-4)-3+9=(5*3-4)*3+9=11*3+9=33+9=42

or

f(3)=2*3^3-3^2-4*3+9=2*27-9-12+9=54-12=42

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Read 2 more answers
Cos x cos (-x) -sin x sin (-x) = 1. Verify the Identity. Please Show All Steps.
umka21 [38]

Answer:

cos x cos (-x) -sin x sin (-x) = 1 ⇒ proved down

Step-by-step explanation:

* Lets revise the angles in the four quadrants

- If angle x is in the first quadrant, then the equivalent angles to it are

# 180 - x ⇒ second quadrant (sin (180 - x) = sin x , cos (180 - x) = -cos x

  tan (180 - x) = -tan x)

# 180 + x ⇒ third quadrant (sin (180 - x) = -sin x , cos (180 - x) = -cos x

  tan (180 - x) = tan x)

# 360 - x ⇒ fourth quadrant (sin (180 - x) = -sin x , cos (180 - x) = cos x

  tan (180 - x) = -tan x)

# -x ⇒fourth quadrant (sin (- x) = -sin x , cos (- x) = cos x

  tan (- x) = -tan x)

* Lets solve the problem

∵ L. H .S is ⇒ cos x cos (-x) - sin (x) sin (-x)

- From the rules above cos x = cos(-x)

∴ cos x cos (-x) = cos x cos x

∴ cos x cos (-x) = cos² x

- From the rule above sin (-x) = - sin x

∴ sin x sin (-x) = sin x [- sin x]

∴ sin x sin (-x) = - sin² x

∴ cos x cos (-x) - sin (x) sin (-x) = cos² x - (- sin² x)

∴ cos x cos (-x) - sin (x) sin (-x) = cos² x + sin² x

∵ cos² x + sin² x = 1

∴ R.H.S = 1

∴ L.H.S = R.H.S

∴ cos x cos (-x) -sin x sin (-x) = 1

8 0
3 years ago
Solve the system graphically:<br><br><br> b <br><br> x−y=0<br> 2x+3y=−5<br> x=<br> y=
vlabodo [156]

Answer:

(-1,-1)

Step-by-step explanation:

x=y

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3 years ago
Nevaeh rolls a standard six-sided die, numbered from 1 to 6. Which word or phrase
liubo4ka [24]

Answer:

Step-by-step explanation:

If she had two dice, a seven is the most common roll you can get, although the odds are still against you.

To get a seven with just 1 die is impossible.

7 0
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