You don't use it usually because teachers usually say use 3.14 as an approximation
Answer:
yes 2.5 and 25/5 is a rational number
If you're asking us to solve for Z...
z² + 11z = -21/4
4z² + 44z + 21 = 0
Enter... *drumroll* the quadratic equation!

(that's a plus or minus, sorry)

x = -0.5 or -10.5
Does this help? Is it too complicated? Do you have any questions?
Answer:
132 students
Step-by-step explanation:
100% means all of something, so 100% can also be written as 1.00
Since we need 55% of 240, we can multiply 240 by 0.55 and get 132.
Answer:
2
- 5
Step-by-step explanation: