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3 years ago

Last question of a really important test! I really need some help!

Mathematics

1 answer:

Ket [755]3 years ago

4 0

Last question of a really important test! I really need some help!

A hollow ball is made of rubber that is 1 centimeter thick. The ball has a radius of 5 centimeters at the outside surface.

What is the approximate volume of rubber used to make the ball?

Use 3.14 for pi.

255.4 cm³

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Question #3: Complete the statement below to show the correct value of 100%. Part A: The expression 100 3 = 10 because 100 = 102

BigorU [14]

Answer:

Step-by-step explanation:

Part A.

Expression $(100)^{\frac{1}{2}}$ = 10

Because 100 = $(10)^{2}$ and $[(10)^2]^{\frac{1}{2}}=10^1=10$

[Since, $(a^{2})^{\frac{1}{2}}=a^{2\times \frac{1}{2}}=a^1$ ]

Part B.

When simplified, the answer is RATIONAL.

[Since, 10 can be written as $\frac{10}{1}$ ]

6 0

3 years ago

Really need help with this math problem. Thanks!

ohaa [14]

Lana = x
Pam = 0.5x - 0.05
Cheryl = 0.5x - 0.05 + 3.10

Total 89$ = Lana + Pam + Cheryl

89 = x + 0.5x - 0.05 + 0.5x - 0.05 + 3.10
89 = 2x + 3
89 - 3 = 2x
86 = 2x
86/2 = x
43 = x

then Pam = 0.5(43) - 0.05
= 21.50 - 0.05
= 21.45

Cheryl = 21.45 + 3.10
= 24.55

3 0

4 years ago

Help pleaseeeeepleassssseeeee

Elina [12.6K]

Area of a trapezoid is height times the average of the bases,

A= 1/2 h (a + b)

Here we have height h=12 and bases a=30, b=12 so area

A = (1/2) (12) (30 + 12) = 6(42)= 252

Answer: B

7 0

3 years ago

Read 2 more answers

Can someone answer this questions?<br><br>also, is 10^5 the same as 1/10^5??

Yuri [45]

$\bf \textit{volume of a sphere}\\\\ V=\cfrac{4\pi r^3}{3}~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=3\cdot 10^2 \end{cases}\implies V=\cfrac{4\pi (3\cdot 10^2)^3}{3} \implies V=\cfrac{4\pi (3^3\cdot 10^{2\cdot 3})}{3} \\\\\\ V=4\pi (3^3\cdot 10^6)3^{-1}\implies V=4\pi 3^33^{-1}\cdot 10^6\implies V=4\pi 3^{3-1}10^6 \\\\\\ V=4\cdot \pi \cdot 3^2\cdot 10^6$

6 0

3 years ago

Help me, but the answer is not E.

olga55 [171]

Answer:

40%

Step-by-step explanation:

To find the percentage difference between the families with 2 dogs and the families with no dogs, we need to find their difference first.

Difference = 45 - 27

= 18

Now that we know the difference, we just have to put the difference over the total as a fraction and multiply by 100%.

Percentage difference = $\frac{18}{45}$ × 100%

= 40%

8 0

3 years ago