Answer:
Is this a scam
Step-by-step explanation:
Answer:
Number 4: Using Pythagoras Theorem,

Number 5:

3:
It is a right triangle
4:
Not a right triangle
For the last one:

Rounded down (because the answer needs to be a whole number) is 21
Answer:
42 pieces
Step-by-step explanation:
you do 378÷9
then you'll get the answer which is 42 pieces
Expand it
-(x+3)^2-1
-(x+3)(x+3)-1
-1(x^2+3x+3x+9)-1
-1(x^2+6x+9)-1
-x^2-9x-9-1
-x^2-9x-10
f(x)=-x^2-9x-10


Substitute 51/5x into

Substitute that into

Hope this helps. Answer should be correct. Unless your quadratic equation is wrongly stated.