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Ierofanga [76]
3 years ago
11

If f(x) =2x3 - 1, then f(-3)=

Mathematics
2 answers:
Vadim26 [7]3 years ago
4 0

Answer:

f(-3)=-19

Step-by-step explanation:

-3 REPLACES THE x

MA_775_DIABLO [31]3 years ago
3 0

Answer:

Step-by-step explanation:

f(x) = 2x^3 - 1

if x = -3,

f(-3) = 2 × (-3)^3 - 1

= 2 × -27 - 1

= -54 -1

= -55

hope this helps

plz mark it as brainliest!!!!!!!!!

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4 0
3 years ago
Cant find the answer
dedylja [7]

Answer:

Carter family = 25 hours

Davis family = 31 hours

Step-by-step explanation:

Let's say the number of hours the Carter family used their sprinkler is x and the number of hours the Davis family used their sprinkler for is y.

So combined:

x + y = 45 hours

and we are also told that:

40x + 15y = 1300 L

So we can do simultaneous equations to solve the problem.

With some rearranging, we can figure out that:

y= 45 - x

and by substituting that into the second equation:

40x + 15 (45 -x) = 40x + 675 - 15x = 1300L

25x = 1300 - 675

25x = 625

x = 25 = hours that the Carter family used their sprinkler

and we can substitute that back into the original equation to find how many hours the Davis family used their sprinkler so:

25 + y = 56

y = 31

The Davis family used their sprinkler for 31 hours whilst the Carter family used their sprinkler for 25 hours.

7 0
2 years ago
A total of 432 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student t
rusak2 [61]

Answer:

  144

Step-by-step explanation:

Adult tickets comprised 1/3 of the total, so 432/3 = 144 tickets.

6 0
4 years ago
In a large population, 82% of the households have cable tv. A simple random sample of 225 households is to be contacted and the
anzhelika [568]

Answer:

The mean of the sampling distribution of the sample proportions is 0.82 and the standard deviation is 0.0256.

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For proportions, the mean is \mu = p and the standard deviation is s = \sqrt{\frac{p(1-p)}{n}}

In this problem, we have that:

p = 0.82, n = 225.

So

\mu = 0.82

s = \sqrt{\frac{p(1-p)}{n}} = \sqrt{\frac{0.82*0.18}{225}} = 0.0256

The mean of the sampling distribution of the sample proportions is 0.82 and the standard deviation is 0.0256.

7 0
3 years ago
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