What number is 30 percent of 200

Mathematics

2 answers:

kirill [66]2 years ago

8 0

Answer:

Step-by-step explanation:

3 goes into 20 6 times

(I first take away the zeros that I dont need if that is what you are wondering)

then you put the zero at the end of it, so it is 60

marta [7]2 years ago

6 0

Answer:

$x = 60$

Step-by-step explanation:

<u>Step 1: Make an expression</u>

What number is 30 percent of 200

$200 * 0.3 = x$

<u>Step 2: Multiply</u>

<u /> $200 * 0.3 = x$

$60 = x$

Answer: $x = 60$

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The number of hours, t, that bacteria spread 10-fold can be modeled by the equation B(t) = B0(10)2t. There are 25 bacteria prese

nordsb [41]

Answer: 1.67 hours.

Explanation:

1) Function that models the number of bacteria:

$B(t)=B_0(10)^{2t}$

2) Bo = 25, then the function is:

$B_0=25(10)^{2t}$

3) To know how many hours will elpase until the number of bactaria is 55,00, you equals B to 55,500 in the equation and solve for t, in this way:

i) start

$55000=25(10)^{2t)$

ii) division property

$2200=10^{2t}$

iii) antilogarithm property

$2t = log_{10}2200$

iv) division property

$t=\frac{log_{10}2200}{2}$

v) Due the operations:

t = 1.67 hours.

Note that the time is less than 2 hours. That sounds fine since after 1 hour there will be 10 times 25 (250 bacteria), and after 2 hours 100 times 25 (2500 bacteria).