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

600,000,000,000, or 6e14

step-by-step explanation:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places