All categories

3 years ago

Can you delete your posts?

Mathematics

2 answers:

DerKrebs [107]3 years ago

6 0

I’d look in the help center but you can probably click on the 3 dots next to your post or contact an admin

ladessa [460]3 years ago

3 0

Pretty sure you click the three dots

You might be interested in

How to write an exponential function whose graph passes through the points (0, -6) and (-2, -54).

suter [353]

Work shown above! Answer is y = -6(1/3)^x
edit: at the bottom it says "be must be 1/3" I meant "b must be"

6 0

3 years ago

In a recent year, companies spent a total of $88.4 billion onnewspaper, television, and radio ads. The total amount spent on t

emmasim [6.3K]

Answer:

(a) amount spent on newspaper ads = $42.8 billion.

(b) amount spent on television ads = $37.2 billion.

(c) amount spent on radio ads = $8.4 billion.

Step-by-step explanation:

Let us denote amount spent on Newspaper ads by symbol N.

amount spent on Television ads by symbol T.

amount spent on Radio ads by symbol R.

Given Total amount spent on newspaper, television, and radio ads =

N + T + R = $88.4 billion -------- [Equation 1]

Total amount spent on television and radio ads was only $2.8 billion more than the amount spent on newspaper ads alone is represented by the expression :

T + R = $2.8 + N ---------- [Equation 2]

The amount spent on newspaper ads was $5.6 billion more than what was spent on television ads.

N = $5.6 + T ----------- [Equation 3]

Now, taking value of R from Equation 1 and Equation 2 respectively we get;

R = $88.4 - T - N ------------ [Equation 4]

R = $2.8 + N - T ------------- [Equation 5]

Equating and solving Equation 4 and 5 we get,

$88.4 - T - N = $2.8 + N - T

$88.4 - $2.8 = 2*N

Hence, N = $42.8 billion.

Now putting value of N in Equation 3 we get T = $42.8 - $5.6 = $37.2 billion.

And at last putting values of N & T in Equation 1 we get,

R = $88.4 - $37.2 - $42.8 = $8.4 billion .

Therefore, amount spent on newspaper ads = $42.8 billion.

amount spent on television ads = $37.2 billion.

amount spent on radio ads = $8.4 billion.

4 0

3 years ago

The product of two numbers is 40. If one of the numbers is 8/15, what is the other number?

Harman [31]

If one number is 8/15, you take the difference which 7/15.

5 0

3 years ago

The heights of 10 year old children has a normal probability distribution with mean of 54.6 inches and standard deviation of 5.7

Fofino [41]

Answer:

a) 0.69

The probability that a randomly selected 10-year old child will be more than 51.75 inches tall

P(X>51.75 ) = 0.6915

Step-by-step explanation:

Step(i):-

Given mean of the Population = 54.6 inches

Given standard deviation of the Population = 5.7 inches

Let 'X' be the random variable of normal distribution

Let 'X' = 51.75 inches

$Z = \frac{x-mean}{S.D} = \frac{51.75-54.6}{5.7} = -0.5$

Step(ii):-

The probability that a randomly selected 10-year old child will be more than 51.75 inches tall

P(X>51.75 ) = P(Z>-0.5)

= 1 - P( Z < -0.5)

= 1 - (0.5 - A(-0.5))

= 1 -0.5 + A(-0.5)

= 0.5 + A(0.5) (∵A(-0.5)= A(0.5)

= 0.5 +0.1915

= 0.6915

Conclusion:-

The probability that a randomly selected 10-year old child will be more than 51.75 inches tall

P(X>51.75 ) = 0.6915

5 0

3 years ago

The CBS’ television show 60 Minutes has been successful for many years. That show recently had a share of 20, which means that a

xxMikexx [17]

Given:
p = 20% = 0.2, sample proportion
n = 5000, sample size.
Confidence level = 95%

The confidence interval is
(p - 1.96k, p + 1.96k)
where
$k=\sqrt{ \frac{p(1-p)}{n} }=\sqrt{ \frac{0.2*0.8}{5000}} =0.00566$

Therefore the 95% confidence interval is
(0.1943, 0.2057) = (19.4%, 20.6%)

Answer: The 95% confidence interval is (19.4%, 20.6%)

6 0

4 years ago