The diameter of a white blood cell under magnification appears to be 0.3 centimeters. what is the diameter of the white blood cell in millimeters? (a microscope has a scale of 250: 1)

Diameter of the cell will be 0.012 mm.

Step-by-step explanation:

The diameter of a white blood cell under magnification was 0.3 centimeters.

Since 1 centimeter = 10 mm

Therefore, 0.3 cm = 0.3×10

                              = 3 mm

If a microscope has a scale of 250 : 1

Then diameter will be in the same ratio.

=

=

Original diameter of the cell =

                                               = 0.012 mm

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step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for