All categories

3 years ago

HELP PLEASE !!!! I am confused on how to arrange this question

Mathematics

2 answers:

Natali5045456 [20]3 years ago

4 0

Answer:

Step-by-step explanation:

Answer: X= Z÷2

X is how long Julia studied for.

Z is how long Jake studied for.

julia studied for half as long as jake. (÷2)

Inessa [10]3 years ago

3 0

$z \div 2$

z ÷ 2

You might be interested in

How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F

Ira Lisetskai [31]

Answer:

a) x = 80.40

s = 29.54

b) lower limit = 69.53

upper limit = 91.27

Step-by-step explanation:

The mean price is:

$\bar X=\frac{1}{n}\sum x_i=\frac{1}{20}(50+80+...+70)=\frac{1608}{20} =80.40$

The standard deviation is

$s=\sqrt{\frac{1}{n-1}\sum(x_i-\bar X)^2}=\sqrt{\frac{1}{19}[(50-80.4)^2+...+(70-80.4)^2]} \\\\s=\sqrt{\frac{15,471}{19} }=\sqrt{814.25} =29.54$

We have to calculate a 90% CI for the mean.

The z-value for a 90% confidence interval is z=1.645.

The margin of error is:

$E=z\cdot \sigma / \sqrt{n}=1.645*29.54/\sqrt{20}=48.59/4.47=10.87$

The 90% CI is

$\bar X-z\sigma/\sqrt{n} \leq \mu \leq \bar X-z\sigma/\sqrt{n}\\\\80.40-10.87 \leq \mu \leq 80.40+10.87\\\\69.53\leq \mu \leq 91.27$

4 0

4 years ago

Help me pls

horsena [70]

We need zeros

$\\ \rm\Rrightarrow 9m^2+3m-2=0$

$\\ \rm\Rrightarrow 9m^2-3m+6m-2=0$

$\\ \rm\Rrightarrow 3m(3m-1)-2(3m-1)=0$

$\\ \rm\Rrightarrow (3m-2)(3m-1)=0$

m=2/3
mm=1/3

4 0

2 years ago

HELP PLEASE!!!!!!!!!!!!!!!

sukhopar [10]

Answer:

Step-by-step explanation:

6 0

3 years ago

I need HELP please!!!!

svlad2 [7]

Answer:

Step-by-step explanation:

Multiply 6 and 15 then you get 90 the you do 6x6 you get 36

After you subtract 90 from 36 = 54

8 0

4 years ago

Solve x^2=28 where x is a real number

Vadim26 [7]

5.291 to 2 d.p I think that is the answer.

7 0

3 years ago