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worty [1.4K]
3 years ago
10

I need help on number 9, picture is included!

Mathematics
1 answer:
saveliy_v [14]3 years ago
3 0
Ok unit conversions

you know that 12 inches are in a foot
and 100 centimeters are in 1 meter

so starting with a)
you start with  2 ft^2

2 ft^2 = \frac{2 ft^2}{} \times \frac{12 in}{1 ft} = 24 ft\  in = \frac{2 ft \ in }{} \times \frac{12 in}{1 ft} = 288 in^2
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A teacher wants to estimate the mean time (in minutes) that students take to go from one classroom to the next. His research ass
PilotLPTM [1.2K]

Answer:

a:  We can't determine this from the given information

b: 98%

Step-by-step explanation:

For a:

n = 42

The confidence interval has equal time on each side of µ, so we can add the two end points and divide them by 2 to find the middle of the interaval:

7.4 + 8.6 = 16

16/2 = 8

Now subtract 7.4 from 8 to find the distance from the mean to the end of the interval

8 - 7.4 = 0.6

So the sample mean, plus the calculated error was 0.6 minutes.

We don't have a way of calculating the sample mean with the given information.  We could only find the sample standard deviation and the variance.

For b:  

We have:

E = 0.6

s = 1.606

n = 42

See attached photo for the calculation of this value

The value is 2.421.

Using a sample size of 42, our degrees of freedom are 41.  Use the t-distribution chart to see which level of confidence has 2.421 under it.

The level of confidence is: 98%

We need 41 degrees of freedom, but the chart has only 40, then 45.  We can see that 40 has 2.423, and the values go down as the degrees of freedom go up, so 41 will correlate to 2.421

6 0
4 years ago
One number exceeds another number by 6. One fourth of the sum of the two numbers is two less than the smaller.
dolphi86 [110]

Answer:

7 and 13

Step-by-step explanation:

let the 2 numbers be x and y , x > y , then

x = y + 6 → (1)

\frac{1}{4} (x + y) = y - 2 ( multiply both sides by 4 to clear the fraction )

x + y = 4y - 8 ( subtract 4y from both sides )

x - 3y = - 8 → (2)

Substitute x = y + 6 into (2)

y + 6 - 3y = - 8

- 2y + 6 = - 8 ( subtract 6 from both sides )

- 2y = - 14 ( divide both sides by - 2 )

y = 7

Substitute y = 7 into (1)

x = 7 + 6 = 13

The 2 numbers are 7 and 13

4 0
3 years ago
Find the sum of the first 6 terms of the following series, to the nearest integer.
natka813 [3]

Answer:

1008

Step-by-step explanation:

geometric sequence:

a=16

r=32/16=2

Sum of GS:

s=a(1-r^n)/(1-r)

S(6)=16(1-2^6)/(1-2)

=1008

8 0
3 years ago
WILL MARK BRAINLIEST!!!
Rus_ich [418]

Answer:

y= -2x -4

Step-by-step explanation:

slope: rise/run = 2/-1 = -2

y-intercept: -4

5 0
3 years ago
Jenelle invested $13000 in two mutual funds. Fund A earned 5% profit during the first year, while Fund B suffered a 2.5% loss. I
nexus9112 [7]

Answer:

hola la respuesta es 3900<em> </em><em>y </em><em>2</em><em>3</em><em>4</em><em>8</em>

Step-by-step explanation:

espero que te sirva

6 0
3 years ago
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