Answer:
the first one: y=2x ²-1
Step-by-step explanation:
Plug in the "x" to the equation, so: 2(2) ²-1 = 7 which is "y" in the table above.
Answer:
See below
Step-by-step explanation:
Number of oak trees

Answer:
x=13
Step-by-step explanation:
1. divide both sides by 3
2. simplify: 4x-7=45
3. add 7 to both sides
4. 4x=52
5. divide both sides by 4
6. x=13
Answer:
Algebraic Expression
Step-by-step explanation:
Hope this helps.
U subtract 4x by 5x and then you add 3 by -21 and the answer is x=18