How do you divide 20 into 42?
20 does not go into 82 easily, which means you must do long division. You know 20 goes into 82 four times naturally (80), which leaves you with 2 left over. At this point, you put a decimal place behind the 4 and add a 0 to the remaining 2. Now, you have 20 going into 20, which is 1. This leaves you with the answer 4.1. To double check your math, you can multiply 4.1 by 20 (4.1x20), which will lead you with 82.
How many chromosomes are there in the human body? In what cases would they have more or less?
Humans normally have 23 pairs of chromosomes, so 46 total. In cases like Downs's Syndrome, there is a genetic disorder on chromosome 21 causing an extra chromosome. An example of too little chromosomes would be Turner Syndrome. In this scenario, a female would be missing an X chromosome.
x^2 + 5x + 4 = 0 How would you go about solving this problem?
To make this type of question easier to understand, you must look at it from this perspective. x^2 + (a+b)x + ab = 0 This can then be broken down as the following: (x + a) x (x + b) You then set both separate equation equal to zero. x + a = 0; x + b = 0 Therefore, x = -a, x = -b. For your equation, it can be broken down to (x + 4) x (x + 1) = 0. This will then get the answer of x = -4, -1