## Forum Replies Created

- AuthorPosts
- July 21, 2021 at 9:41 am in reply to: Which experiments led to changes to the original cell theory? #10589::
The correct answer is :

**(iii)**Experiments that showed that all cells are similar in how they metabolize and in their composition.

The cell theory is really an idea that came about regarding cells and living organisms. The 1st person to discover and name cells was

**Mr. Robert Hooke**, who coined the term to describe the structures he saw making up the**cork**.This would not have been possible if it had not been for the development of the microscope during the 17th century, which allowed these cells to be visible.

- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 21, 2021 at 8:43 pm in reply to: A sequence is defined by the recursive formula f (n + 1) = f(n) – 2. If f(1) = 18, what is f(5)? #10822::The correct answer is

**C**:**10**

The given formula states that the next term in the sequence is generated by subtracting two(2) from the first one. We know that the first term is (18), therefore we have-f(1) = 18

f(2) = f(1) – 2 = 18 – 2 = 16

f(3) = f(2) – 2 = 16 – 2 = 14

f(4) = f(3) – 2 = 14 – 2 = 12

f(5) = f(4) – 2 = 12 – 2 = 10

- This reply was modified 2 years, 11 months ago by gargij.

July 21, 2021 at 10:29 pm in reply to: Using the quadratic formula to solve x^2 + 20 = 2x, what are the values of x? #10846::**The correct answer is (A) :****Given**: x^2 + 20 = 2x**Then**: x^2 – 2x + 20 = 0a = 1, b = -2, c = 20

The quadratic formula is :

**x = (- b ± √(b^2 – 4ac)) / (2a)****Substitute the values in formula**x = -(-2) ± √((-2)^2 – 4(1)(20)) / 2(1)

x = 2 ± 2 i √19 / 2

x = 1 – i √19 and 1 + i √19

**Hence the value of X is x**= 1 – i √19 and 1 + i √19 - AuthorPosts