Answer:
Step-by-step explanation:
Use the formule V=4/3 *Pi*R^3
where R =10
so V=4/3*Pi*10^3
v= 4000Pi/3 =4188.7902
Let x be total hours of battery life. We have been given that battery life of Vera's phone is down to 2/5. So remaining battery life,

We have been also given that it drains another 1/9 every other hour. Now let us substitute our given information into an equation.

Now we will solve for x.


Let us convert 2/5 into minutes. We know 1 hour has 60 minutes.

Therefore, remaining battery life will be 5 hours and 24 minutes.
Answer:
Step-by-step explanation:
let p¼ = a, q¼ = b
L.H.S. = (a - b)(a + b)(a² + b²) = (a² - b²)(a² + b²) = (a²)² - (b²)² = p - q = R.H.S.
$21 because 3$x$7(numbers of days in a week)is $21. I hope this helps :)