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andreev551 [17]
3 years ago
5

1+1= PLZZZZZZZZ HELP OMG

Mathematics
2 answers:
just olya [345]3 years ago
8 0

Answer:2

Step-by-step explanation:

Llana [10]3 years ago
7 0

Answer:

the answer is 2

Step-by-step explanation:

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If the shadow of a tree is 14 m long and the shadow of a person who is 1.8 m tall is 4 m long, how tall is the tree?
tigry1 [53]
Ratio and proportion

real:shadow

so the person is 1.8m but the shadow is 4m
so
real:shadow=1.8:4

so
1.8:4=?:14
1.8/4=?/14
times both sides by 14
25.2/4=?
6.3=?

the tree is 6.3 m tall
8 0
3 years ago
A researcher wished to compare the effect of two stepping heights (low and high) on heart rate in a step-aerobics workout. A col
Alinara [238K]

Answer:

The answer is "between 0.10 and 0.05".

Step-by-step explanation:

For sample 1:

n_1 = 25\\\\\bar{x_1} = 90.00\\\\ s_1 = 9\\\\

For sample 2:

n_2 = 25\\\\ \bar{x_2} = 95.08\\\\ S_2 = 12\\\\

Calculating the null and alternative hypotheses:

H_O : \mu_1 = \mu_2 \\\\ H_Q : \mu_1  

Calculating the test statistic:

Z= \frac{90-95.08}{ \sqrt{\frac{9^2}{25}+\frac{12^2}{25}}} \\\\ =\frac{-5.08}{ \sqrt{\frac{81}{25}+\frac{144}{25}}}\\\\=\frac{-5.08}{ \sqrt{\frac{81+144}{25}}}\\\\=\frac{-5.08}{ \sqrt{\frac{225}{25}}}\\\\=\frac{-5.08}{ \frac{15}{5}}\\\\=\frac{-5.08}{3}\\\\= -1.693

Calculating the conservative degrees of freedom:

DF = min (n_1 -1, n_2 - 1) = min(25-1, 25-1) = 24

by using Excel the p-value for left tailed test and for test statistic will be -1.693 with DF = 24.

\to p-value = TDIST(1.693, 24, 1) = 0.0517\ \ \ \  i.e, \bold{0.05 < p-value < 0.10}

5 0
3 years ago
Please solve x/2 &gt; -4
andriy [413]
<h3>Answer: x > -8</h3>

Multiply both sides by 2 so that you go from

x/2 > -4

to

x > -8

The inequality sign will not flip since we are not multiplying both sides by a negative number.

If you are curious how to graph the solution, draw out a number line and plot an open unfilled circle at -8. Then shade to the right of the open circle. The open circle says "do not include this value as part of the solution set". The solution set is shaded representing all of the values larger than -8 (which make the original inequality true).

3 0
4 years ago
How do I solve Special quadratics?
mel-nik [20]

http://www.purplemath.com/modules/specfact.htm

7 0
3 years ago
A bag contains 4 green marbles, 3 blue marbles, and 8 red marbles. What is the probability that you will draw a blue marble when
Romashka-Z-Leto [24]

Answer:

1/5

Step-by-step explanation:

The total number of marbles in the bag is fifteen, and the total number of blue marbles is 3/15. 3/15 simplified is 1/5.

7 0
4 years ago
Read 2 more answers
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