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3 years ago

I need help on this plz i don’t understand the question

Mathematics

1 answer:

AnnZ [28]3 years ago

3 0

We know that the area of a circle in terms of π will be πr². However the area with respect to the diameter will be a different story. The first step here is to find a function relating the area and diameter of any circle --- ( 1 )

For any circle the diameter is 2 times the radius,

d = 2r

Therefore r = d / 2, which gives us the following formula through substitution.

A = π(d / 2)² = πd² / 4

<u>Hence the area of a circle as the function of it's diameter is A = πd² / 4. You can also say f(d) = πd² / 4.</u>

Now we can substitute " d " as 4, solving for the area ( A ) or f(4) --- ( 2 )

f(4) = π(4)² / 4 = 16π / 4 = 4π - <u>This makes the area of circle present with a diameter of 4 inches, 4π.</u>

You might be interested in

The probability that the fish is black is 2 / 5.

Over [174]

Answer:

probility that fish is not black is 3/5

Step-by-step explanation:

it' s because the full fraction is 5/5 minus 2/5 which is fish is black. so the left is 3/5 which is not black

6 0

3 years ago

Can someone please help me in this question.

mestny [16]

Answer:

a) $2^{3}$

b) $2^{5}$

c) $2^{8}$

d) $\frac{5}{2^{3} }$

e) $2^{4} + 2^{3}$

Step-by-step explanation:

a) 8 = 2 x 2 x 2

b) 32 = 2 x 2 x 2 x 2 x 2

c) 256 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2

d) 5 x 2^3 / 64 = 5 x 8 / 64

= 40/64

= 5/8

= $\frac{5}{2^{3} }$

e) 16 - (-2)^3 = 16 - (-8)

= 16 + 8

= $2^{4} + 2^{3}$

6 0

3 years ago

Kylie explained that (negative 4 x + 9) squared will result in a difference of squares because (negative 4 x + 9) squared = (neg

Eva8 [605]

Given:

The given expression is:

$(-4x+9)^2$

According to Kylie,

$(-4x+9)^2=(-4x)^2+(9)^2$

$(-4x+9)^2=16x^2+81$

To find:

The correct statement for Kylie's explanation.

Solution:

We have,

$(-4x+9)^2$

According to the perfect square trinomial $(a+b)^2=a^2+2ab+b^2$ .

$(-4x+9)^2=(-4x)^2+2(-4x)(9)+(9)^2$

$(-4x+9)^2=16x^2-72x+81$

Kylie did not understand that this is a perfect square trinomial, and she did not determine the product correctly.

Therefore, the correct option is C.

4 0

3 years ago

Read 2 more answers

Find the angle measures. Justify your responses.

MatroZZZ [7]

Answer:

m∠3 = 2x - 10° and m∠6 = 3x + 20

m∠3 = 58° ; m ∠6 = 122°

Step-by-step explanation:

a ║ b

m∠2 = m∠6 If ║ cut by a transversal, then corresponding angles

are ≅ and =

m∠7 = m∠3 If ║ cut by a transversal, then corresponding angles

are ≅ and =

m∠2 = 3x + 20 Given

m∠7 = 2x - 10 Given

m∠6 + m∠3 = 180° If ║ cut by a transversal, then each pair of same-side

interior angles (also called consecutive interior angles

are supplementary (sum = 180°) .

3x + 20 + 2x - 10 = 180°

5x + 10 = 180°

5x = 170°

x = 34°

Answer: m∠3 = 2x - 10° and m∠6 = 3x + 20

m∠3 = 2(34) - 10 ; m∠6 = 3(34) + 20

m∠3 = 58° ; m ∠6 = 122°

5 0

2 years ago

Halla la suma de 3, ocho veces un número, y tres veces el mismo número

prohojiy [21]

Answer:

huh?

Step-by-step explanation:

6 0

3 years ago