You can use MathPapa it will help you
1. 8
2. 15
3. 2
4. 1/2
5. 3
those are the answers in order, hope this helps!
Answer: 4x² -4
Step-by-step explanation:
First, evaluate the exponent you'll get, 
+ 4x² -5 then evaluate to get, 1+ 4x² -5. Next, subtract the numbers, 1 + 4x² -5 then to get, -4 +4x². Lastly, rearrange the terms, -4 +4x² turns into, 4x² -4!
The mass should be 75.71 grams
To find density is D = M / V
So you would have to multiply the volume by the density
