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3 years ago

A sphere has diameter 28 cm. If the diameter is divided by 2, what is the effect on the surface area?

Mathematics

1 answer:

spayn [35]3 years ago

4 0

Answer:

The surface area is divided by 4.

Step-by-step explanation:

Surface area of a sphere is 4πr².

When the diameter is 28 the radius is 14. So: 4π(14)² = 784π

If you cut the diameter in half you get 14. The radius is now 7.

4π(7)² = 196π.

784/4 = 196 so divided by 4.

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PLEASE HELP! I AM REALLY CONFUSED! find the value of a if X^3+8x^2+ax-2 is divisible by x-1

WARRIOR [948]

The value of a from the equation is -63.

Here we have to find the value of a.

Given data:

The equation is = x³ + 8x² + ax -2

The equation is divisible by x -1

So we have:

x -1 = 0

x = 1

Now putting the value in the equation we get the remainder as o because the equation is divisible by x -1.

So;

1³ + 8² + a(1) - 2 = 0

63 + a = 0

a = -63

Therefore we get the value of a as -63.

To know more about the equation refer to the link given below:

brainly.com/question/14107099

#SPJ4

4 0

1 year ago

What is the slope of the line? As soon as possible please !!

mixer [17]

Answer:

$m=\frac{-8}{5}$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Slope Formula: $m=\frac{y_2-y_1}{x_2-x_1}$

Step-by-step explanation:

Step 1: Define

Find points from graph.

Point (-1, 4)

Point (4, -4)

Step 2: Find slope m

Substitute [Slope Formula]: $m=\frac{-4-4}{4+1}$
Subtract/Add: $m=\frac{-8}{5}$

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3 years ago

The pair of points (6, y) and (10, -1) lie on a line with slope

Anni [7]

Answer:

-2

Step-by-step explanation:

(-1) - (-2) = 1 and then 10 - 6 = 4 which gets you 1/4

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luda_lava [24]

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3 years ago

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Maurinko [17]

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Step-by-step explanation:

L=length W=width H=height •= times(multiply)

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2 years ago