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Brrunno [24]
2 years ago
14

If y = x2 + x -1, find y if x = 3. y =

Mathematics
2 answers:
marishachu [46]2 years ago
8 0

Answer:

y=3

Step-by-step explanation:

y = 3x2 + 3x-1

y = 6 + -3

y = 3

Sati [7]2 years ago
6 0

Answer:

y=8

Step-by-step explanation:

y=2x+x-1

replace x with 3

y=2(3)+(3-1)

y=6+2

y=8

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Answer:

x^2+8x

Step-by-step explanation:

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3 years ago
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3 0
3 years ago
Read 2 more answers
A bacteria culture starts with 100 bacteria and doubles in size every half hour.
taurus [48]

Answer:

y=25600

y=100(2)^{2t}

y=252

Step-by-step explanation:

A bacteria culture starts with 100 bacteria and doubles in size every half hour.

y=100(2)^{2x}

where x represents the number of hours

(a) t= 4 hours

Plug in 4 for t  and find out the number of bacteria y

y=100(2)^{2 \cdot 4}\\y=25600

25600 bacteria

y=100(2)^{2t}

convert 40 seconds into hour

40 divide by 60 =2/3

y=100(2)^{2\frac{2}{3} }\\y=100(2)^{\frac{4}{3} }\\\\y=252

The graph is attached below

4 0
3 years ago
A piece of wood is 3 1/2 feet long how many total inches long is it?
Kamila [148]

Answer:

42 inches

Step-by-step explanation:

1 foot is 12 inches

12 times 3=36

12 divided by 2=6

36+6=42

8 0
3 years ago
How does the formula for the sample mean differ from the formula for population mean? Multiple choice question. To calculate the
Katen [24]

Answer:

The formulas are functionally the same, but 'n' (the sample size) is used instead of 'N' (the population size).

Step-by-step explanation:

The sample mean is the average value for a set of observations which is derived from a population. While the population mean is the average value for the entire set of observation belonging to a particular study of interest.

The set of observation belonging to a population is denoted by 'N' ; while the sample size is denoted as 'n' :

The mean formula is written thus :

Population mean = Σx / N

Sample mean = Σx / n

Where, x = set of values.

6 0
3 years ago
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