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2 years ago

12

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

1 answer:

Ket [755]2 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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What is (x-2)(x+2) in standard from

trasher [3.6K]

Answer= x^2-4

I hope this helps.

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2 years ago

Subtract 7a<br><br>2<br><br>-4ab+2b<br><br>2<br><br>from 3ab+7a2+2b2

LUCKY_DIMON [66]

Answer:

Step-by-step explanation:

3ab + 7a² + 2b² - (7a² - 4ab + 2b²) = 3ab + 7a² + 2b² - 7a² + 4ab - 2b²

Now combine like term. Like terms have same variable with same power.

= <u>3ab + 4ab</u> <u>+ 7a² - 7a²</u> + <u>2b² - 2b²</u>

= 7ab

4 0

2 years ago

raketka [301]

Answer:

The answer is 12

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2 years ago

if the recommended daily allowance for vitamin c is 60 mg per day and there are 70 mg of vitamin C per 100 g orange, how many 3.

noname [10]

Answer: 7

Step-by-step explanation:

Given : The recommended daily allowance for vitamin c is 60 mg per day .

Then, for one whole week , the recommended allowance for vitamin c will be :-

$7\times60=420\text{ mg}$

Also, there are 70 mg of vitamin C per 100 g orange.

1 g = 1000 ml

The proportion of Vitamin C in 100 g = $\dfrac{70}{100000}=0.0007$

1 oz =28.3495 grams

Then, $3\ oz= 3\times28.3495=85.0485 \text{ gm}=85048.5\ mg$

Then, amount of vitamin C in 85048.5 mg = $0.0007\times85048.5=59.53395\approx59.53\ mg$

Then, the number of oranges have to eat each week to meet this requirement= $\dfrac{420}{59.53}\approx7$

Hence, about 7 oranges you would have to eat each week to meet this requirement.

8 0

3 years ago

Someone help me please

garri49 [273]

Answer:

3

Step-by-step explanation:

4 0

2 years ago