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My name is Ann [436]
3 years ago
12

Negative 4 equals r/20 minus 5

Mathematics
1 answer:
levacccp [35]3 years ago
5 0

Answer: r = - 20

Step-by-step explanation:

-4 = \frac{r}{20} - 5

\frac{r}{20} = 4-5

\frac{r}{20}=-1

\frac{r}{20}*20 = -1 * 20

r = -20

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The town of Hayward (CA) has about 50,000 registered voters. A political research firm takes a simple random sample of 500 of th
timama [110]

Answer: (0.076, 0.140)

Step-by-step explanation:

Confidence interval for population proportion (p) is given by :-

\hat{p}\pm z_{\alpha/2}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}

, where \hat{p} = sample proportion.

n= sample size.

\alpha = significance level .

z_{\alpha/2} = critical z-value (Two tailed)

As per given , we have

sample size : n= 500

The number of Independents.:  x= 54

Sample proportion of Independents\hat{p}=\dfrac{x}{n}=\dfrac{54}{500}=0.108

Significance level 98% confidence level : \alpha=1-0.98=0.02

By using z-table , Critical value : z_{\alpha/2}=z_{0.01}=2.33

The 98% confidence interval for the true percentage of Independents among Haywards 50,000 registered voters will be :-

0.108\pm (2.33)\sqrt{\dfrac{0.108(1-0.108)}{500}}\\\\=0.108\pm2.33\times0.013880634\\\\=0.108\pm0.03234187722\\\\\approx0.108\pm0.032=(0.108-0.032,\ 0.108+0.032)=(0.076,\ 0.140)

Hence, the 98% confidence interval for the true percentage of Independents among Haywards 50,000 registered voters.= (0.076, 0.140)

8 0
3 years ago
What is the value of x in this equation
eduard
The the first one the answer should be -4

For the second one the answer should be 3
7 0
3 years ago
Read 2 more answers
A pancake recipe requires two and three quarters cups of milk to one cup of flour. If three and two thirds cups of milk is used,
MrRissso [65]

Answer:

3/4 cups of flour are needed.

Step-by-step explanation:

(3 2/3)/1=(2 3/4)/x

(11/3)/1=(11/4)/x cross multiply.

11x/3=11/4 cross multiply.

4*11x=3*11

44x=33

x=33/44

x=3/4

3 0
3 years ago
The equation a = 1300(1.02)7 is being used to calculate the amount of money in a savings account. what does 1.02 represent in th
yaroslaw [1]
For this case we have an equation of the form:
 y = A * (b) ^ t
 Where,
 A: initial amount
 b: growth rate
 t: time
 The given equation is:
 a = 1300 (1.02) ^ 7
 Where,
 b = 1.02
 It represents a growth of 2% on the initial amount.
 Answer:
 
1.02 represented in this equation a growth of 2% on the initial amount.
7 0
3 years ago
What is the volume of this rectangular pyramid?
kipiarov [429]
The answer is 270 . if you multiply all the yds together you will get the solution to your volume
7 0
4 years ago
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