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Vika [28.1K]
2 years ago
8

-10r-20=-20 i need help with this question​

Mathematics
2 answers:
svetoff [14.1K]2 years ago
8 0

Answer:

r = 0

Step-by-step explanation:

To solve this for r, add 20 to both sides.  The result will be -10r = 0, and so

the solution is r = 0.

maks197457 [2]2 years ago
7 0

Answer:

0

Step-by-step explanation:

-10r - 20 = -20

-10r = -20 + 20

-10r = 0

r = <u>0</u>

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In a study of cereal leaf beetle damage to oats, researchers measured the number of beetle larvae per stem in small plots of oat
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Answer:

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(d) H0: MeanMalathion - MeanNoMalathion equals 0

H1: MeanMalathion - MeanNoMalathion not equals 0

Step-by-step explanation:

Test statistic (t) = (mean 1 - mean 2) ÷ sqrt[pooled variance (1/n1 + 1/n2)]

Let the difference between the two means be x and the pooled variance be y

n1 = 5, n2 = 12

t = x ÷ sqrt[y(1/5 + 1/12)] = x ÷ sqrt(0.283y) = x ÷ 0.532√y = 1.88x/√y

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significance level = 0.05 = 5%

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Fail to reject the null hypothesis because the test statistic 0.94 falls within the region bounded by the critical values.

The scientist's claim is right.

A null hypothesis is a statement from a population parameter which is either rejected or accepted (fail to reject) upon testing. It is expressed using the equality sign.

An alternate hypothesis is also a statement from a population parameter which negates the null hypothesis and is accepted if the null hypothesis is rejected. It is expressed using any of the inequality signs.

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