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2 years ago

Area of a circle, diameter = 16.8cm

Mathematics

2 answers:

MakcuM [25]2 years ago

8 0

Answer:

221.56 cm^2 or 70.56pi

Step-by-step explanation:

Area of a circle = pi*radius^2

Radius = diameter/2, radius = 8.4

3.14(8.4)^2 = 221.56 cm squared, or 70.56pi

Vesnalui [34]2 years ago

5 0

Answer:

Step-by-step explanation:

Area of circle=Pi times radius^2

Diameter is half of radius=8.4

Pi*8.4^2=221.670777637

Hope this helps!

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2 years ago

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3(1.5x+9)= tell me NOW

Misha Larkins [42]

Answer:

x = -6

Step-by-step explanation:

Simplifying

3(1.5x + 9) = 0

Reorder the terms:

3(9 + 1.5x) = 0

(9 * 3 + 1.5x * 3) = 0

(27 + 4.5x) = 0

Solving

27 + 4.5x = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-27' to each side of the equation.

27 + -27 + 4.5x = 0 + -27

Combine like terms: 27 + -27 = 0

0 + 4.5x = 0 + -27

4.5x = 0 + -27

Combine like terms: 0 + -27 = -27

4.5x = -27

Divide each side by '4.5'.

x = -6

Simplifying

x = -6

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3 years ago

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2 years ago

❗❗100POINTS❗❗+BRAINLIEST FOR CORRECT ANSWER Show that 8x²-6x-275=0 thanks.

BaLLatris [955]

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Here's the solution ~

Area of a Trapezoid is :

$\qquad \sf \dashrightarrow \: \dfrac{1}{2} \times (sum \: of \: parallel \: sides) \times height = 133 \: c {m}^{2}$

so ~

$\qquad \sf \dashrightarrow \: \dfrac{1}{2} \times ((x + 5) + (3x - 2)) \times (2x - 3) = 133 \:$

$\qquad \sf \dashrightarrow \: \dfrac{1}{2} \times (x + 5+ 3x - 2) \times (2x - 3) = 133 \:$

$\qquad \sf \dashrightarrow \: \dfrac{1}{2} \times (4x + 3) \times (2x - 3) = 133 \:$

$\qquad \sf \dashrightarrow \: \dfrac{1}{2} \times(8 {x}^{2} - 12x + 6x - 9) = 133 \:$

$\qquad \sf \dashrightarrow \: \dfrac{1}{2} \times(8 {x}^{2} - 6x - 9) = 133 \:$

$\qquad \sf \dashrightarrow \: (8 {x}^{2} - 6x - 9) =( 133 \times 2)\:$

$\qquad \sf \dashrightarrow \: 8 {x}^{2} - 6x - 9 =266\:$

$\qquad \sf \dashrightarrow \: 8 {x}^{2} - 6x - 9 - 266 = 0$

$\qquad \sf \dashrightarrow \: 8 {x}^{2} - 6x - 275 = 0$

hence, we got the required equation ~

3 0

2 years ago

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