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3 years ago

If (x)= 2x square minus 1,then f(-3)

Mathematics

2 answers:

viva [34]3 years ago

4 0

Answer:

17.

Step-by-step explanation:

f(x) = 2x^2 - 1

f(-3) = 2(-3)^2 - 1

= 2 * 9 - 1

= 18 - 1

= 17

Hope this helps!

krok68 [10]3 years ago

4 0

Hope it will help u....

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Answer:

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Step-by-step explanation:

since there's 3 friends and r is 90 and the start off each paying 5 dollars

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Select the graph that does not represent two quantities in a proportional relationship.

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The answer is b since it does not touch the origin! (0,0)

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3 years ago

Pauline travels between two cities. First she drives for 40 minutes at an average speed of 88 km/hr then for 40 minutes at an av

Scilla [17]

Pauline's average speed for this trip is 64 km/hr.

Explanation

First we will convert each 'minutes' into 'hours' . So......

40 minutes = $\frac{40}{60}hours =\frac{2}{3} hours$ and 23 minutes = $\frac{23}{60}hours$

Now, $Distance = Speed* Time$

So, the distance traveled for first 40 minutes at 88 km/hr speed $=(88* \frac{2}{3})km = 58.67 km$ ,

the distance traveled for next 40 minutes at 75 km/hr speed $=(75*\frac{2}{3})km=50 km$ and

the distance traveled last 23 minutes at 49 km/hr speed $=(49*\frac{23}{60})km = 18.78 km$

So, the total distance traveled $=(58.67+50+18.78) km = 127.45 km$

She spends 17 minutes eating lunch and buying gas.

So, the total time taken for the trip $= (40+40+17+23)minutes = 120 minutes= 2 hours$

Thus, Pauline's average speed for this trip = (Total distance / Total time) $=(\frac{127.45}{2})km/hr = 63.725 km/hr =64 km/hr$ (Rounded to the nearest km/hr)

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3 years ago

On a school bus, the female teacher sitting in front of me asked if I passed gas, why did she ask me that out of nowhere and whi

kobusy [5.1K]

Answer: She was buggin'

Step-by-step explanation:

If you divide the fact that she's a teacher

kids can smell sometimes

Logically you would get: maybe she thought she smelled something

But when you apply the 'mind your own business rule, it cancels out any chance of her turning around to ask you that

so you're answer is: she was buggin'