Answer:
11 years old
Step-by-step explanation:
If four brothers have the average age 6, then the sum of their ages is

years.
Let x years be the age of sister. If four brothers and their sister have the average age 7, then

Multiply this equation by 5:

The sister is 11 years old.
..Ok......
Volume she wants should be same for both cake pieces.
Now see volume of a sphere which is a circus ball=4/3πr³
And volume of a cone is 1/3πr²h
if both are equal
4/3πr³=1/3πr²h
after simplify this
4r=h
4(3)=h
h=12 inches
They will both explode at 450ft at 1 1/4 seconds.
<span>So we want to know what is the money lost or profited in the 4 year period of the store if the money lost for two years was 13000$ and 21000$ and money profited was 129000$ and 310000$. To get the answer we simply add the annual losses and profits: -13000$-21000$+129000$+310000$=405000$. So after 4 years the overall profit is 405000$. </span>
Answer:
26
Step-by-step explanation:
I multiplied 13 x 2 and got 26