PLEASE help me with this question!! I really need help!

Mathematics

2 answers:

pochemuha2 years ago

6 0

First, use the volume of sphere formula by plugging in the volume into the equation to get the value of r cubed. Then get r by determining the cube root of r cubed. Once you have the value of r, plus that into the surface area of sphere formula to get the surface area of the balloon. Answer: 324pi inches squared (use radian mode on calculator)

alexdok [17]2 years ago

5 0

Answer:

324π in²

Step-by-step explanation:

The surface area of a sphere = 4πr² ( r is the radius )

Calculate r using the volume (V) formula

V = $\frac{4}{3}$ πr³

Here V = 972π , thus

$\frac{4}{3}$ πr³ = 972π ( divide both sides by π )

$\frac{4}{3}$ r³ = 972 ( multiply both sides by 3 to clear the fraction )

4r³ = 2916 ( divide both sides by 4 )

r³ = 729 ( take the cube root of both sides )

r = $\sqrt[3]{729}$ = 9

Thus

surface area = 4π × 9² = 4π × 81 = 324π in²

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What is the value of the following expression?

monitta

The expression (−81)(−9) will give the value of 729.

Step-by-step explanation:

The given expression is (−81)(−9) .

The both numbers in the expression are negative numbers and they are given inside the brackets.

This means that, the negative numbers must be multiplied to get a final value.

The rules in multiplication are :

Positive number × Positive number = positive number
Negative number × Positive number = negative number
Positive number × Negative number = negative number
Negative number × Negative number = positive number

From the rules, it can be determined that the result of any two negative numbers will be a positive number.

So, eliminate option A) and B) because they have negative sign.

The expression (−81)(−9) = -81 × -9

⇒ 729.

Therefore, the option C) and D) are not in match with 729. None of the options are not the value of the given expression (−81)(−9).

6 0

3 years ago

un frasco de jugo tiene una capacidad de 3/8 de litro ¿cuantos frascos se pueden llenar con cuatro litros y medio de jugo?

tangare [24]

Tenemos que

la capacidad del frasco es igual a 3/8 de litro
cuatro litros y medio es igual a decir 4 1/2 litros----> (4*2+1)/2----> 9/2 litros

realizamos una regla de tres
si un frasco tiene capacidad para--------------> 3/8 litros
X frascos-----------------------------------------> para 9/2 litros
X=(9/2)/(3/8)--------> 72/6-----> 12 frascos

la respuesta es
12 frascos

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2 years ago

What is the expression?

pentagon [3]

Step-by-step explanation:

Take a look at the picture, And tell me if am wrong