Anybody know the last bit PLS help me

see explanation

Step-by-step explanation:

The equation of a circle centred at the origin is

x² + y² = r² ( r is the radius )

x² + y² = 49 ← is in this form

with r = = 7

(a)

Thus A = (7, 0 ) and B = (0, 7 )

Given the endpoints (x₁, y₁ ) and (x₂, y₂ ) then the midpoint is

[ (x₁ + x₂ ), (y₁ + y₂ ) ]

Here the midpoint ofA(7, 0) and B(0, 7) is

M = [(7 + 0), (0 + 7) ] = (, )

(b)

The equation of a line in slope- intercept form is

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

Calculate m using the slope formula

m  

with (x₁, y₁ ) = O(0, 0 ) and (x₂, y₂ ) = M(, )

m = = 1, thus

y = x + c ← is the partial equation

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

Using (0, 0), then

0 = 0 + c ⇒ c = 0

y = x ← equation of line

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!

answer is 33

step-by-step explanation: