The diagram shows two circles with the same centre. The radius of the smaller circle is 2cm and the diameter of the larger circle is 8cm. Find the exact value of the area. hello pls help me with question and show full working out ty :)

12π sq. cm.

Step-by-step explanation:

To calculate the area of the shaded part, we will have to deduct the area of the smaller circle (s) from the area of the bigger circle(b).

Area b = π x 4^2

= 16π

Area s = π x 2^2

= 4π

Area of shaded part = 16π - 4π = 12π

Step-by-step explanation:

Area of larger circle:

=>

Where r = 4

=>

=> cm²

Area of smaller circle:

=>

Where r = 2

=>

=> cm²

Area of shaded part:

=>

=> cm²

goog may have it for you

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form