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shusha [124]
3 years ago
8

Someone please help me with this

Mathematics
1 answer:
Slav-nsk [51]3 years ago
7 0
So first we need to find out how many days we're looking at. The equation we need to use is ?x5=45 to which the answer is 9.
Now that we know the amount of days we simply multiply. 20x9=180

Therefore Preston has spent 180 minutes reading or 3 hours total
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Is it first or second? Please help me.
Colt1911 [192]
This is in first person.
3 0
3 years ago
Read 2 more answers
The Jurassic Zoo charges $13 for each adult admission and $4 for each child . The total bill for the 238 people from a school tr
slava [35]

Answer:

42 adults and 196 children went to the zoo

Step-by-step explanation:

Let

x ----> the number of adults

y ----> the number of children

we know that

The total bill for the 238 people from a school trip was $1330

so

x+y=238 ----> equation A

13x+4y=1,330 ----> equation B

Solve the system of equations by graphing

Remember that the solution is the intersection point both graphs

using a graphing tool

the solution is the point (42,196)

see the attached figure

therefore

42 adults and 196 children went to the zoo

6 0
3 years ago
Solve for n. then find the value of m for each value of n<br> 8n=-3m+1
Eva8 [605]
Basically, solve for n, then find aanother tha is solve for m


8n=-3m+1
divide both sides by 8
n=-3/8m+1/8

and find m
8n=-3m+1
minus 1 both sides
8n-1=-3m
divide both sides by -3
-8/3n+1/3=m
m=-8/3n+1/3

6 0
3 years ago
I rlly don’t understand due today please help!
tatuchka [14]

Answer:

a) 2x+4

b)x=8

Step-by-step explanation:

a) x+x+4 =2x +4

b) 2x+4= 20

2x = 16

x=8

Jay bought 8 packets of Chips

c) Jay: 8 x 60

=£4,80

Lauren : 12 × 60

= £7,2

7 0
2 years ago
Based on a poll conducted by the Centers for Disease Control, 862 of 1013 randomly selected adults said that they always wear se
ivolga24 [154]

The confidence interval is  0.028, 0.872

<h3>Given </h3>

862 of 1013 randomly selected adults  wear seat belts.

The 95% confidence interval for the proportion of adults who always wear seat belts.

<h3>What is confidence interval?</h3>

A Confidence Interval is defined as a range of values we are sure our true value lies within it.

<h3>What is 95% confidence interval?</h3>

A 95% confidence interval is defined as that if we take 100 different samples and compute a 95% confidence interval for each sample, then approximately 95 of the 100 confidence intervals will contain the true mean value.

= 862/1013 = 0.85

At a 95% confidence interval ,the critical value is z_{0.025}  = 1.96

The 95% confidence interval for proportion is

\widehat p +/- z0.025 * sqrt(\widehat p * (1 - \widehat p)/n)

= 0.85 +/- 1.96 * sqrt(0.85 * (1 - 0.85)/1013)

= 0.85 +/- 0.022

= 0.028, 0.872

The sample should use at least 10 successes and 10 failures.

n * \widehat p = 1013 * 0.85 = 861 > 10

n * (1 - \widehat p) = 1013 * 0.15 = 152 > 10

As the sample size is larger, we can use an approximate formula for the standard error.

Learn more on Confidence intervals here:

brainly.com/question/8961482

#SPJ4

3 0
2 years ago
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