All categories

3 years ago

Bring me home with this home in 10 11 12 and 13

Mathematics

2 answers:

spin [16.1K]3 years ago

6 0

Marla Paid 72$ or 71.99$ because 20% is 18$ so you subtract 90 by 18.

Mariana [72]3 years ago

3 0

10: 1140
11: ?
12: about $18
13: ?

You might be interested in

A company needs to replace 27 out of 45 desks in their office. What percent of the desks need to be replaced?

sleet_krkn [62]

60%

Solve by creating a proportion
27/45 = x/100

Cross multiply to get 2700=45x

Divide 45 on both sides to get x=60

6 0

3 years ago

Read 2 more answers

Michael is 12 years older than Brandon. Seventeen years ago, Michael was 4 times as old as Brandon.

4vir4ik [10]

Answer:

21 yrs old

Step-by-step explanation:

m= michael age

b=Brandon age

m=b+12

m-17=4(b-17)= 4b-68 --»»m = 4b -51

//put b+12 instead m// b+12=4b-51

3b=63 --»»b=21

Brandon age is 21

Michael age is 33

3 0

3 years ago

Read 2 more answers

at maximum speed , an airplane travels 1680 miles against the wind in 5 hours flying with the wind , the plane can travel the sa

Westkost [7]

X = velocity of plane
y = velocity of wind

x - y = 1680/5 = 336 mph .....(1) [ plane flying against the wind]
&
x + y = 1680/4 = 420 mph....(2) [ plane flying with the wind]

Adding (1) and (2) to eliminate y gives

2x = 756
x = 378 mph is the speed of the plane with no wind.

3 0

3 years ago

Read 2 more answers

Which binomial is a factor of the expression?<br><br><br>Zoom in to see clearer :)

sweet [91]

Answer:

x + 3 is the factor of given expression !!!

Step-by-step explanation:

here's the solution in attachment.

8 0

3 years ago

A toy manufacturer wants to know how many new toys children buy each year. A sample of 305 children was taken to study their pur

Harrizon [31]

Answer:

The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.8}{2} = 0.1$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.1 = 0.9$ , so Z = 1.28.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.28\frac{1.5}{\sqrt{305}} = 0.1$

The lower end of the interval is the sample mean subtracted by M. So it is 7.6 - 0.1 = 7.5

The upper end of the interval is the sample mean added to M. So it is 7.6 + 0.1 = 7.7

The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.

8 0

3 years ago