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3 years ago

What is the value of f(x)=1/2x+5 when x=4?

Mathematics

1 answer:

Soloha48 [4]3 years ago

6 0

Answer:

f=7/4

Step-by-step explanation:

substitute x for 4 and do the equation you will get the equation f(4)=1/2(4)+5 simplify to the equation to 4f=2+5. Then do the addition and get 4f=7. Divide both sides by 4 and get f=7/4

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Solve 2x2 − 4x − 5 = 0 by completing the square.

arsen [322]

For this case we have the following polynomial:
$2x ^ 2 - 4x - 5 = 0
$
Rewriting we have:
$2x ^ 2 - 4x = 5

x ^ 2 - 2x = 5/2$
Then, completing squares we have:
$x ^ 2 - 2x + (-2/2) ^ 2 = 5/2 + (-2/2) ^ 2
$
Rewriting:
$x ^ 2 - 2x + (-1) ^ 2 = 5/2 + (-1) ^ 2

x ^ 2 - 2x + 1 = 5/2 + 1

(x-1) ^ 2 = 7/2$
$x-1 = +/- \sqrt{7/2} x = 1 +/- \sqrt{7/2}$
Then, the solutions are:
$x1 = 1 + \sqrt{7/2} x2 = 1 - \sqrt{7/2}$
Answer:
$x1 = 1 + \sqrt{7/2} 

x2 = 1 - \sqrt{7/2}$

3 0

4 years ago

Reasoning: Krishan wants his quiz average to be at least 90 so that he can get an A in the class. His current quiz scores are: 8

BigorU [14]

Answer:

<u><em>D. 95</em></u>

Step-by-step explanation:

The average is also known as the mean. To find the mean, you need to add all the values, then divide them by the number of terms:

1 2 3

1+2+3

6/3=2

The mean for the example would be 2. Now, using your values, you can use the options to see which one gives you an average of 90:

A.) 85

$80+100+85+85=350\\\frac{350}{4} =87.5$

B.) 90

$80+100+85+90=355\\\frac{355}{4}= 88.75$

C.) 92

$80+100+85+92=357\\\frac{357}{4} =89.25$

D.) 95

$80+100+85+95=360\\\frac{360}{4} =90$

The next score on the quiz needs to be 90 for the mean to be 90.

4 0

3 years ago

Jake plans to make and sell wooden birdhouses. He plans to sell each birdhouse for $50, his income can be found using the equati

kykrilka [37]

Answer:

290 Is the answer I answered it before

5 0

3 years ago

(30 POINTS) What are the y intercepts of the circle whose equation is (x+2)^2+(y-4)^2=13?

muminat

Hello from MrBillDoesMath!

Answer: Choice C

Discussion:

The y-intercepts are the x values where y = 0. Substituting y = 0 in the equation gives

(x+2)^2 + (0-4)^2 = 13 =>

(x+2)^2 + 16 = 13 =>

Subtract 16 from both sides

(x+2)^2 = 13 - 16 = -3 (*)

The square of a real number is greater than or equal to 0. (Not true for complex numbers). The left side of (*) is therefore >= 0 but as also equals -3. This is not possible so there is no solution to the equation. Choice C.

Thank you,

MrB

6 0

4 years ago

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VLD [36.1K]

Answer:

I'm not sure how to help-

Step-by-step explanation:

What would you need help with? C:

3 0

3 years ago