answer 7,8,9 and 10 for brainliest and also a ! ( and get 20 points if answered correctly if your not or answering then you will get reported ! )

Vsphere=(4/3)(π)r³
Vcylinder=(h)(pi)(r²)
Vcone=(1/3)(h)(pi)(r²)

7.
d/2=r, 10/2=5
V=(4/3)(π)(5³)
V=(500π)/3
aprox 523.598666 in³

8.
h=30
r=15
V=(30)(π)(15²)
V=6750pi aprox 21205.746 ft³

9.
d=8
d/2=8/2=4=r
h=12
V=(1/3)(12)(π)(4²)
V=64π aprox 201.06188 cm³

10.
V=volume

r=radius

π=aprox 3.141592, it is the ratio of the circumference to the diameter

h=height

Intersecting secant-tangent theorem states that if a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment.so to break it down: 1. pq acts as the tangent and ps as the secant with an intersection at p.sr = 21rp = 3x + 3pq = 4x + 4following to equation: tangent squared = the two segments multiplied by each otherso (4x + 4) ^ 2 = (3x + 3) • (21) simplifies to 16x^2 - 31x - 47 = 0 or (16x - 47)(x + 1) x = -1 or x = 47/162. pq acts as the tangent and ps as the secant with an intersection at p (again! )sr = 16rp = xpq = 15(15) ^ 2 = 16 • x225 = 16xx = 225/163. the interesting chords are proportional to each other so a ratio is possible to set up: ap dp 10 3 + x = = —— = pc pb 8 xcross multiple to get 10x = (3 + x)(8)x = 12