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NikAS [45]
4 years ago
12

Will give brainliest!

Mathematics
2 answers:
andrew11 [14]4 years ago
7 0
The first step to solving a system of equations using substitution is to substitute an equation equal to one variable in for that variable in the other equation.
2x+3(x+1.5)=12 
Tanzania [10]4 years ago
6 0

Answer:2x+3(x+1.5)=12

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The best method for obtaining a representative sample is to choose a _____ from the population of interest.
Ilya [14]

Answer:

Random sample

Step-by-step explanation:

In statistics, a sample randomly taken from an investigated population, usually known as a random sample. To avoid having bais from our response and for it to have the best chance of it being indicative of the entire population, our sample must be random. This random sample chosen must contain subjects related to the data in the population we what to obtain a result from.

3 0
3 years ago
A school bought pens, each costing $1, and pencils, each costing $0.5. The cost of the whole purchase was $220. How many pens an
Aleks [24]

Answer:

<u>The number of pens = 120 and the number of pencils = 200</u>

Step-by-step explanation:

Let the number of pens x, and the number of pencils is y

the cost of one pen $1, and the cost of one pencil $0.5

The cost of the whole purchase was $220

1 * x + 0.5 * y = 220

x + 0.5 y = 220 ⇒ eq.(1)

there were 80 more pencils than pens

y - x = 80 ⇒ eq.(2)

from eq.(2) x = y - 80

By substitution with x from the last equation at eq.(1)

∴ (y - 80) + 0.5 y = 220

1.5y = 220 + 80 = 300

y = 300/1.5 = 200

x = y - 80 = 200 - 80 = 120

<u>So, the number of pens = 120 and the number of pencils = 200</u>

7 0
3 years ago
Henry is an avid reader.He devours 90 pages in half-an-hour.How many pages has Henry read per minute?
ICE Princess25 [194]

Answer:

3 pages per minute

Step-by-step explanation:

Half an hour is eqquivalent to 30 minutes, so we do 90 (pages) / 30 (minutes) = 3--> Wich means that Henry can read 3 pages per minute.

4 0
3 years ago
Read 2 more answers
If a formula had addition, division, exponents, and brackets which would the spreadsheet calculate first?
kondaur [170]
It would calculate brackets first.
6 0
3 years ago
Read 2 more answers
Reasoning : Why is the numerator greater than
Digiron [165]

Answer:

See the explanation

Step-by-step explanation:

When the numerator is less than the denominator, the result is always less than 1, that is 0. something and this will give a percentage less than 100, but when the numerator is greater than the denominator, th result is greater than 1, and any figure greater than 1 gives a percentage that is greater than 100

example

Numerator >Denominator

=4/2*100

=2*100

=200%

Numerator <Denominator

=2/4*100

=0/5*100

=50%

5 0
3 years ago
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