6 Two circles have circumferences of 10 cm
and 12 cm. What is the difference in their
radii?
7 A chord of a circle subtends an angle of 60°
at the centre of a circle of radius 7 cm. Find
the perimeter of the minor segment of the
circle.
8 A piece of thread was wound tightly round a
cylinder for 20 complete turns. The thread
was found to be 3.96 m long. Calculate the
diameter of the cylinder in cm.
9 Calculate the perimeter of a sector of a circle
of radius 27 cm, the angle of the sector being
140°.

89

step-by-step explanation:

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

answer by yourhope:

hi! : )

a farmer that lived in ancient egypt would most likely be barried in the sand, in the desert!

: )