You said you’d give 30 points but i only see 15 there ☹️
Answer:
Yes, you can square a negative number. In fact, any number at all can be squared, even numbers like pi and 0. This is because to square a number just means to multiply it by itself. ... Note that this is positive because when you multiply two negative numbers you get a positive result.
Step-by-step explanation:
number 2
Answer:
9%
Step-by-step explanation:
Let the required number be 100.
Now, according to the question, the number is first increased by 30 %
⇒ 100 + 30 % of 100
⇒ 100 + [(30*100)/100]
⇒ 100 + 30
⇒ 130
Then, it is decreased by 30 %
⇒ 130 - (30 % of 130)
⇒ 130 - [(30*130)/100]
⇒ 130 - 39
⇒ 91
Net Decrease = 100 - 91
= 9
Percent Decrease = (Change in number*100)/100
⇒ (9*100)/100
= 9 %
<u>Answer-</u>

<u>Solution-</u>
Given expression is 
Applying Binomial Theorem

Here,
a = x, b = 2 and n = 4
So,

Expanding the summation




Total meat in the recipe he wants to use = 7 pounds
Beef : pork = 3 : 1
Total pork that he will use = x 7 pounds
= 7/4 pounds
hope this helps