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3 years ago

a first number plus twice a second number is 4. twice the first number plus the second number totals 26. find the numbers

Mathematics

1 answer:

blagie [28]3 years ago

3 0

Answer:

a = 16

b = -6

Step-by-step explanation:

a + 2b = 4

2a + b = 26

2a + 4b = 8

2a + b = 26

3b = -18

b = -6

a + 2(-6) = 4

a - 12 = 4

a = 16

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Problem PageQuestion Calcium levels in people are normally distributed with a mean of mg/dL and a standard deviation of mg/dL. I

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Complete Question

The complete question is shown on the first uploaded image

Answer:

The calcium level that is the borderline between low calcium levels and those not considered low is $c = 8.68$

Step-by-step explanation:

From the question we are told that

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The standard deviation $\sigma = 0.5 \ mg/dL$

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3 years ago

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Which term of the AP 21, 18, 15 ...... is -81 ?

amid [387]

Given AP is 21 ,18,15,...

First term = 21

Common difference = 18-21 = -3

Let an = -81

We know that

an = a+(n-1)d

⇛21+(n-1)(-3) = -81

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⇛24-3n = -81

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⇛ 105= 3n

⇛ n = 105/3

⇛ n = 35

35th term of the AP is -81.

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3 years ago