<span>Using the
formula d=m/v, we first need to convert 5.0 and 45.0 to their SI unit
equivilents. 5.0g is 0.005kg, 45.0cm^3 becomes 0.000045m^3.Therefore, the density of your cube is 0.005/0.000045=111.11 kg/m^3(5 s.f)</span>
The angle required will be given by:
x=52/5π-5*2π=2/5π
the positive angle less than one revolution around the unit circle that os co-terminal with angle of 52/5π is 2/5π
Point a is at (-2,4) => (x1,y1)
Midpoint is (2.5, 3.5) => (a,b)
Point B is (x2, y2)
To find midpoint we use formula

a= 2.5, b= 3.5, x1= -2 and y1= 4
Plug in all the values and findout x2, y2

multiply 2 on both sides to remove fraction
(5 = -2+x2 , 7 = 4+ y2)
5 = -2+x2, so x2= 7
7 = 4+ y2, so y2= 3
The point B is ( 7, 3)