Need help soon plz,

Mathematics

1 answer:

astra-53 [7]2 years ago

7 0

Step-by-step explanation:

Find two points on the line.

20 is a multiple of both 4 and 5, so the points (5, 0) and (0, 4) are on the line.

Click those two points and you have your line!

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Solve 2(x+4)= 20 Solve this please

Natasha2012 [34]

2x+8=20
2x=20-8
2x=12
12/2=x
6=x

6 0

2 years ago

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To obtain information on the corrosion-resistance properties of a certain type of steel conduit, 45 specimens are buried in soil

Fiesta28 [93]

Answer:

The sample has not met the required specification.

Step-by-step explanation:

As the average of the sample suggests that the true average penetration of the sample could be greater than the 50 mils established, we formulate our hypothesis as follow

$H_0$ : The true average penetration is 50 mils

$H_a$ : The true average penetration is > 50 mils

Since we are trying to see if the true average is greater than 50, this is a right-tailed test.

If the level of confidence is α = 0.05 then the $z_\alpha$ score against we are comparing with, is 1.64 (this is because the area under the normal curve N(0;1) to the right of 1.64 is 0.05)