Chloe and libby want to tie ryan to a bunch of approximatley spherical helium balloons of diameter 0.3m. thr volume of each balloon can be approximated ising the formula 4r3 given that. 1 litre of helium can lift 1g and that ryan weighs 5stone 5 poundsestimate how many balloons they need to make him float

Aproximately 2,525 balloons.

Step-by-step explanation:

 1. Find the volume of a balloon with the formula given in the problem, where is the radius (), then you have:

2. Convert the volume from m³ to lliters by multiplying it by 1,000:

3. You know that that 1 liter of helium can lift 1 gram and that Ryan weighs 5 stone and 5 pounds. So you must make conversions shown below:

1 g=0.0022 lb

From 5 stones to pounds:

4. Then Ryan's weigh is:

5. Then, if 1 liter of helium can lift 0.0022 lb, to lift 75 lb (which is the weight of Ryan) they need:

6. Then, to calculate the aproximated number of balloons they need to make him float (which can call ), you must  divide the liters of helium needed to lift the weight of Ryan by the volume of a balloon, then the result is:

≈2,525 balloons.

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol