Answer:
1. They help you with estimation
2. It makes numbers simpler and easier to do
3. Makes mental maths much quicker
Answer: 15x^2 + 8x - 8
Step-by-step explanation:
1) Add them together
(15x^2 + 3x - 4) + (5x - 4)
2) Combine like terms
15x^2 + 8x - 8
Answer:
=15.4
Step-by-step explanation:
6^2+(3.4)-24 = 36+3.4−24
36+3.4−24
39.4−24
=15.4
