Answer:80
Step-by-step explanation:
15% of 80 is 12
80/10=8=10%
8/2=4=5%
8+4=12=15% of 80
Step-by-step explanation:
- First, the radical needs to be alone on one side of the equation, if there is - 4, - 3 next to it then you'll have to transfer it to the opposite side like that:
5. (y+7)^0.5 - 4=4
(y+7)^0.5=8......
- Second, you need to square the two sides of the equation :
5.((y+7)^0.5) ^2=8^2
Y+7=64
Y+7-7=64-7
Y=57
Note: if the radical's index is (2) then you'll square the two sides of the equation, but if the index is (3) you'll have to cube the two sides of the equation, "look at the exercises 9,10"
Answer:
#3) (4/3) pi r^3
(4/3) pi 4^3
(4/3) pi 64
volume = 21.333pi cm^3
#4) (4/3) pi r^3
(4/3) pi 14^3
(4/3) pi 2744
volume = 3658.666pi cm^3
Step-by-step explanation:
hmu for more info
Answer:
511
Step-by-step explanation:
a-b = 7 ____eq 1
ab = 8 ____eq 2
a = 7 + b ___eq 3
a = 8/b ___eq 4
using simultaneous equations :
7 + b = 8/b
7b + b^2=8
b^2 + 7b - 8 =0
factorize it
b^2 + 8b - b - 8 = 0
b(b+8) -1(b+8)=0
b = 1 , -8
then a = 8/1 = 8
a =8/-8 = -1
a = 8, -1
so,
a^3 - b^3
= (8)^3-(1)^3
= 511
Answer:
6/18
Step-by-step explanation: