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OverLord2011 [107]
4 years ago
8

The chess club has 12 boys, 16 girls, and 2 coaches. Wrote the following ratios in the simplest form. Boys to girls. girls to bo

ys. Coaches to students.
Mathematics
1 answer:
ExtremeBDS [4]4 years ago
7 0

Answer:

3:4, 4:3 and 1:14

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A turtle traveled 1/10 miles in 1/2 hour, what was the turtles rate in miles per hour
Ivan

Answer:

.2 mph

Step-by-step explanation:

6 0
3 years ago
Use spherical coordinates. Find the volume of the solid that lies within the sphere x^2 + y^2 + z^2 = 81, above the xy-plane, an
Natasha_Volkova [10]

Answer:

The volume of the solid is 243\sqrt{2} \ \pi

Step-by-step explanation:

From the information given:

BY applying sphere coordinates:

0 ≤ x² + y² + z² ≤ 81

0  ≤ ρ²   ≤   81

0  ≤ ρ   ≤  9

The intersection that takes place in the sphere and the cone is:

x^2 +y^2 ( \sqrt{x^2 +y^2 })^2  = 81

2(x^2 + y^2) =81

x^2 +y^2 = \dfrac{81}{2}

Thus; the region bounded is: 0 ≤ θ ≤ 2π

This implies that:

z = \sqrt{x^2+y^2}

ρcosФ = ρsinФ

tanФ = 1

Ф = π/4

Similarly; in the X-Y plane;

z = 0

ρcosФ = 0

cosФ = 0

Ф = π/2

So here; \dfrac{\pi}{4} \leq \phi \le \dfrac{\pi}{2}

Thus, volume: V  = \iiint_E \ d V = \int \limits^{\pi/2}_{\pi/4}  \int \limits ^{2\pi}_{0} \int \limits^9_0 \rho   ^2 \ sin \phi \ d\rho \   d \theta \  d \phi

V  = \int \limits^{\pi/2}_{\pi/4} \ sin \phi  \ d \phi  \int \limits ^{2\pi}_{0} d \theta \int \limits^9_0 \rho   ^2 d\rho

V = \bigg [-cos \phi  \bigg]^{\pi/2}_{\pi/4}  \bigg [\theta  \bigg]^{2 \pi}_{0} \bigg [\dfrac{\rho^3}{3}  \bigg ]^{9}_{0}

V = [ -0+ \dfrac{1}{\sqrt{2}}][2 \pi -0] [\dfrac{9^3}{3}- 0 ]

V = 243\sqrt{2} \ \pi

4 0
3 years ago
A survey of Mr. Thorne’s class shows that 5 out of 8 students will buy lunch today. Based on this result, how many of the 720 st
Ipatiy [6.2K]
450


5:8.
X:720

8x90=720 so multiply 5x90

450
7 0
3 years ago
List all the 4-digit even numbers that can be created by rearranging these number tiles.
Stels [109]

2000

4000

6000

8000

2460

2440

2420

4280

4260

4220

6666

Step-by-step explanation:

2000

2420

2440

2460

4000

4220

4260

4280

6000

6666

8000

4 0
3 years ago
Translate the word problem using an inequality and solve and graph it.
galben [10]

Answer:

ok

Step-by-step explanation:

6 0
3 years ago
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