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kicyunya [14]
3 years ago
13

Given F(x) =3x^2 - 4 and F(a) = 8 find a

Mathematics
1 answer:
Bogdan [553]3 years ago
5 0

F(x)=3x^2-4\\\\F(a)=8\to3a^2-4=8\qquad\text{add 4 to both sides}\\\\3a^2=12\qquad\text{divide both sides by 3}\\\\a^2=4\to a=\pm\sqrt4\to a=\pm2\\\\Answer:\ \boxed{A.\ \pm2}

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The fence along the length of a ranch measures 4,450.5 meters and the fence along the width of a ranch measures 2,890 meters.
lawyer [7]
Given:Length = 4,450.5 metersWidth = 2,890 meters
1 kilometer = 1,000 meters
Length: 4,450.5 meters * 1km/1,000 meters = 4,450.5 km/1,000 = 4.4505km
Width: 2,890 meters * 1km/1,000 meters = 2,890 km/1,000 = 2.89 km
4.4505 km - 2.89 km = 1.5605 km
The length of the fence is 1.5605 km longer than the width of the fence.

3 0
3 years ago
What is the radius of a circle with a circumference of 36(3.14) cm
mart [117]
It should be 18, because despite of 3,14, because that's pi and radius is half of the diameter, so36 divide 2 is 18.
6 0
3 years ago
X2 - 10xy + 3y + y2 - 1 2 3 4 5
lesantik [10]

Answer:

Answer:  There are 5 (five terms) in the expression shown.

Step-by-step explanation:

_______________________________________________________

      In the expression shown:

___________________________________________________

         " x² − 10xy + 3y + y² − 1 " ;

___________________________________________________         

             →  These 5 (five terms) are:

______________________________________________

                  x² , -10xy,  3y,  y²,  and  -1 .

______________________________________________

5 0
3 years ago
The cost y (in dollars) to rent a lane at the bowling alley is proportional to the number x of hours that you rent the lane. It
Alika [10]

Answer:

a) y = 9x

b) For every increase of 1 hour the price to rent the lane increases by $9.

c) $27

Step-by-step explanation:

a) Since it costs $18 for 2 hours we can infer that for every 1 hour it costs $9.

So, the equation would look like this:

y = 9x

b) In this context, for every increase of 1 hour the price to rent the lane increases by $9. Like the question gave us, the price for 2 hours cost $18.

c) Plug 3 into the equation:

y = 9(3)

y = 27

Therefore, it costs $27 to rent the lane for 3 hours.

<em>I hope this helps!!</em>

<em>- Kay :)</em>

5 0
2 years ago
Read 2 more answers
If T equals 1 / r + 1 / s equals r + S over RS, then what is 1 / T in terms of R&amp;S?
Thepotemich [5.8K]
T=\dfrac{1}{r}+\dfrac{1}{s}\\\\T=\dfrac{1\cdot s}{r\cdor s}+\dfrac{1\cdot r}{r\cdot s}\\\\T=\dfrac{s}{rs}+\dfrac{r}{rs}\\\\T=\dfrac{s+r}{rs}\to\dfrac{1}{T}=\dfrac{rs}{s+r}
7 0
3 years ago
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