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katrin2010 [14]
3 years ago
13

Write 2.1 times 10 to the fifth power in standard form

Mathematics
1 answer:
Lelu [443]3 years ago
4 0
2.1 times 10 to the fifth power is 2.1 to the power of 5 (4 0's) 
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a 40 gram sample of a substance that's used for drug research has a k-value of 0.1446. find the substance's half life in days
Novay_Z [31]

The applicable decay formula is:N = No*e^(-kt)WhereN = Mass left after time tNo = Original massk = constantt = half lifeUsing the values given,N/No = e^(-0.1446t) = 1/2ln (1/2) = -0.1446 t *ln e^1-0.6931 = -0.1446 tt = 0.6331/0.1446 = 4.79 daysTherefore, half-life is 4.8 days.

3 0
3 years ago
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2. José is using 12 brown tiles and
Karolina [17]

Answer:

12:20

Step-by-step explanation:

your trying to find the ratio to brown tiles to one section and theirs 12 brown tiles per section so you would start off with 12. and to find how many tiles would be in each section you would have to add 8 and 12 and you would end up with 20 which the number of tiles in each section

3 0
3 years ago
En un colegio hay 315 alumnos de los cuales 1/3 son mujeres y el resto hombres. 2/7 de los hombres juegan al fútbol y el resto a
statuscvo [17]

Answer:

150 hombres juegan baloncesto.

Step-by-step explanation:

En una escuela hay 315 alumnos de los cuales 1/3 son mujeres y el resto son hombres.

Paso 1

Encontramos el número de estudiantes que son mujeres

= 1/3 × 315

= 105 mujeres.

Se nos dice que el resto son hombres. Por lo tanto, el número de hombres que son estudiantes se da como:

= 315 - 105 mujeres

= 210 hombres

Paso 2

2/7 de los hombres juegan fútbol y el resto baloncesto.

Esto significa que 2/7 de 210 hombres juegan al fútbol

= 2/7 × 210 hombres

= 60 hombres

Por tanto, 60 hombres juegan al fútbol.

Paso 3

También se nos dice que el resto juega al baloncesto.

El número de hombres que juegan baloncesto se calcula como:

210 - 60

= 150 hombres.

Por tanto, 150 hombres juegan baloncesto.

6 0
3 years ago
Can someone please help me this is due today
sp2606 [1]

Answer:

1. 83.6

2. 24

3. 95/2

4. 3

5. 30

6. 84.5

Step-by-step explanation:

4 0
2 years ago
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3/4^2 + 1^2 = x2<br><br> solve for x with work shown! pls help!
photoshop1234 [79]

Answer:

X=19/32

Step-by-step explanation:

3/4^2+1^2=2*x

3/4^2+1=2x

3+(4^2)/4^2=2x

3+16/4^2=2x

19/4^2=2x

19/(2^2)^2=2x

19=16(2x)

19=16*2x

32x=19

32x/32=19/32

x=19/32

This took alot of time goodluck!

8 0
2 years ago
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