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3 years ago

A scientist wants to predict the number of nitrates in the river. Which sample is better for making this prediction?

Mathematics

1 answer:

Ray Of Light [21]3 years ago

8 0

Answer:

Sample B: A random sample of 5 gallons of water from five different locations in the river

Step-by-step explanation:

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Eloise hung artwork on 2/5of a bulletin board.she hung math papers on 1/5of the same bulletin board.what part of the bulletin bo

erica [24]

Here, number of bulletin board = 1
Artwork = 2/5 th, & math papers = 1/5

So, it would be: 1/5 + 2/5 = 3/5

In short, Your Answer would be 3/5 or 0.60

Hope this helps!

7 0

3 years ago

You deposit $600 in a savings account. the account earn 4% simple interest per year.

12345 [234]

Answer:

use some memes juice

Step-by-step explanation:

memes

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3 years ago

Simplify: −7 + {12 − 3[50 − 4(2 + 3) ] }

DedPeter [7]

Answer:

-85

Step-by-step explanation:

1) (2 + 3)

-7 + {12 - 3[50 - 4(5) ] }

2) -7 + {12 - 3[50 - 20] }

-7 + {12 - 3[30] }

3) -7 + 12 - 90

5 - 90

Answer: -85

6 0

4 years ago

30 POINTS!

Goshia [24]

Answer:

The correct answare would be 3.54 x 10^22 N

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3 years ago

Solve for x : log(3x) + log(x + 4) = log(15). Please explain it to me.

zlopas [31]

Answer:

x = 1

Explanation:

$\sf \rightarrow log(3x) + log(x + 4) = log(15)$

Rule: log(a) + log(b) = log(ab)

$\sf \rightarrow log(3x(x + 4)) = log(15)$

cancel out log on both sides

$\sf \rightarrow 3x(x + 4) = 15$

relocate constant variable

$\sf \rightarrow 3x^2 + 12x -15 = 0$

take 3 as a common factor

$\sf \rightarrow 3(x^2 + 4x -5) = 0$

divide both sides by 3

$\sf \rightarrow x^2 + 4x -5 = 0$

middle term split

$\sf \rightarrow x^2 + 5x -x-5 = 0$

factor common terms

$\sf \rightarrow x(x + 5) -1(x+5)= 0$

collect into groups

$\sf \rightarrow (x-1)(x+5)= 0$

set to zero

$\sf \rightarrow x-1 = 0 , \ x+5= 0$

relocate variables

$\sf \rightarrow x = 1, \ x = -5$

There must be a positive solution for log, so the solution is only x = 1

3 0

2 years ago

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