Answer: A triangle can either be... an
Acute-angled triangle.
Obtuse-angled triangle.
Right-angled triangle.
Step-by-step explanation: Here is an image of each type of triangle based on its angles.
Answer:
You shoud invest $0.204, it is an small amount each month.
The formula to calculate the monthly saving is

with PP: periodic payments, A: amount desired, n: number of payments in one year, Y: number of years.
In this case A = 88, n= 12 (the payments are monthly), Y=18, APR=7%.
Replacing in the formula you obtain that 
-6 , +5
I hope I helped you
Keep learning and reviewing your times tables.