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konstantin123 [22]
3 years ago
13

Simplify 3x + 6x 2 - 5x - x 2

Mathematics
2 answers:
Natali5045456 [20]3 years ago
6 0
I think the answer is c
lbvjy [14]3 years ago
5 0
3x + 6x 2 -5x- x2
3x-5x=-2x
-2x+6x2-x2

−2 + 6 2− 2
6x2-x2=5x2

−2+52

5x2 -2x
Answer is C
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Arisa [49]
Hey there!

To figure out how much money each person has, we need to divide. 

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5 0
3 years ago
If f(x) = x2 − 1, and f(2a) = 35, then what could be the value of a ?
Naily [24]
<span>f(x)=<span>x2</span>−1</span>That means to find the value of the function at any value of x, we square x and subtract 1. If <span>x=2a</span>, we square <span>2a</span> and subtract 1:<span>f(2a)=(2a<span>)2</span>−1=4<span>a2</span>−1</span>Now, we know that <span>f(2a)=35</span>so we can find the value of a:<span>f(2a)=(2a<span>)2</span>−1=4<span>a2</span>−1=35</span><span>4<span>a2</span>−1+1=35+1</span><span>4<span>a2</span>=36</span><span><span>a2</span>=9</span><span><span>a=±3</span></span>
5 0
3 years ago
the average annual income, /, in dollars, of a lawyer with an age of x years is modeled with with the following function: I=-425
krek1111 [17]

Answer:

26 years of age.

Step-by-step explanation:

The average annual income, I, in dollars, of a lawyer with an age of x years is modeled with with the following function:

I = - 425x² + 45500x - 650000 .......... (1)

If the average annual income of the lawyer at the age of x years is $250000, then from the equation (1) we can write

- 425x² + 45500x - 650000 = 250000

⇒ - 425x² + 45500x - 900000 = 0

⇒ - 17x² + 1820x - 36000 = 0

Now, using the quadratic formula,

x = \frac{- 1820 \pm \sqrt{(1820)^{2} - 4(-17)(- 36000) } }{2(- 17)} = \frac{-1820 + 929.73}{- 34} = 26 years (Approximate)

{We have neglected the other root as we need the youngest age}(Answer)

4 0
4 years ago
In a given course a student receives preliminary examination grades of 81, 85, and 95. The final examination is weighed for one-
Vsevolod [243]

Answer:

B. 96

Step-by-step explanation:

Let x represent score of final third exam.

We have been given that in a given course a student receives preliminary examination grades of 81, 85, and 95.

Let us find average of preliminary scores.

\frac{81+85+95}{3}=\frac{261}{3}=87

We have been given that the final examination is weighed for one-third and the average of the preliminary grades is weighed as 2/3 of the final grade. This means that final grade is equally weighed into 3 parts. The two parts are 87 each and third part is x.

Using our given information, we can set an equation as:

\frac{87+87+x}{3}=90

\frac{174+x}{3}=90

\frac{174+x}{3}*3=90*3

174+x=270

174-174+x=270-174

x=96

Therefore, the final examination grade should be 96 for a semester average of 90.

4 0
3 years ago
Find sin A, round to the nearest hundredth.
almond37 [142]

Answer:

.92

Step-by-step explanation:

sin A = opp side/ hypotenuse

       

We can use the Pythagorean theorem to find the hypotenuse

a^2 + b^2 = c^2  where a and b are the legs and c is the hypotenuse

3^2 +7^2 = AC ^2

9+49 = AC ^2

58 = AC^2

Taking the square root

sqrt(58) = hypotenuse

sin A = 7/sqrt(58)

sin A =.91914503

sin A = .92

6 0
3 years ago
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