124k views
1 vote
1. simplify 2n×6+8n.

2. what are the factors of x²- 6x+9.
3. calculate the volume of a cylinder 8cm long and 3.5cm in diameter.
4. if 4 is added to 3 times a certain number, the result is 31. find the number.
5. calculate a²+b² if a+b = 8 and a-b = 6

1 Answer

6 votes
Answer:1. 20n
2. x=3, x=3
3. 76,97cm^2
4. X=9
5. 52

Explanation:
1. 2n x 6 +8n
= 12n + 8n= 20n
2. x² - 6x + 9 = 0
x -3
x -3
(x-3)*(x-3)=0
x=3 , x=3
3. V=π*r^2*h
h=8cm
r=3,5/2=1,75
V= π * 1,75^2*h
4. 3X+4=31
3X=27
X=9
5. (a+b)^2=8^2
a²+ b²+2ab=64
ab=6
a²+ b²+12=64
a²+ b²=52
User Manu Varghese
by
7.9k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories