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olga nikolaevna [1]
2 years ago
8

Solve the system by substitution. - 2x – 10y = -2 -4y = x

Mathematics
1 answer:
mihalych1998 [28]2 years ago
4 0

Answer:

x = -4 and y = 1

Step-by-step explanation:

hope this helps please like and mark as brainliest

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The average systolic blood pressure was found to be 140 mm for people who have high responsibility jobs, specifically investment
defon

Answer:

t = -1.428

Step-by-step explanation:

Average blood pressure among people with high responsibility jobs = u = 140 mm

Number of people sampled for the study = n = 51

Average blood pressure of the sample = x = 139 mm

Standard deviation of the sample = s = 5 mm

The claim is that practicing yoga decreases the blood pressure. So we have to test that after practicing yoga, the average blood pressure will be lesser than 140. Based on this we can formulate the null and alternate hypothesis as:

Null Hypothesis: \mu \geq 140

Alternate Hypothesis: \mu < 140

Since population standard deviation is not known, we cannot use z-distribution for this test. We are given the value of sample standard deviation, so t-test will be used for this case.

Test statistic is calculated as:

t=\frac{x-u}{\frac{s}{\sqrt{n} } }

Using the values in this formula gives us:

t=\frac{139-140}{\frac{5}{\sqrt{51}}}\\\\ t=-1.428

Therefore, the value of test statistic is -1.428

4 0
3 years ago
The baseball diamond is really a square. The distance between each of the bases is 90 feet. How far does the catcher have to thr
Zina [86]
A^2 + b^2 = c^2

base lines: home to first is a, first to second is b, home to second is c.

90^2 + 90^2 = c^2
or
\sqrt{ {90}^{2}  +  {90}^{2} }  = c
c = 127.28
...approximately
5 0
3 years ago
Read 2 more answers
What is the inverse of y=5x-5
Leya [2.2K]

Answer:the answer is in the picture below

Step-by-step explanation:plz give brainlist

8 0
2 years ago
Look at the image below
Alexandra [31]

that's what I got, you can confirm if it's correct or not... I'm not sure

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6 0
2 years ago
3x^2-5=43 how do i solve this using the square root property
slava [35]

Answer:

x = 4

x = -4

Step-by-step explanation:

bro i dont know but i hope this help a little, sorry

4 0
3 years ago
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