**Answer with explanation:**

Consider a vector having 4 elements

it's first and third elements are equal.

That is,

** **

**So, Dimension of vector=3**

The first 10 and 50 digits of Pi:

3.14159265 35897932384626433832795028841971693993751

**Answer:**

**5/7, 5/10 then, 2/6**

**Step-by-step explanation:**

**Convert them to decimals, to order them properly,**

**How do you do that?, well you have to divide the numerator with the denominator, and how? you could use a calculator, and there is a specific long division method for that.**

Your answer is A its the only one where it subtracts the original price with the discount

**Answer:**

4*4*4*4*4= 1024 phone calls after 5 rounds of calls including the presidents initial 4 calls