The vertex (x,y) can be found by x = -b/2a a=8 b= -64
use this value of 'x' in the equation to calculate the 'y' of the vertex.....
80000 = 40000 (1+.06)n solve for 'n'
2 = 1.06n
log2 / log 1.06 = n = .......... years
The axis of symmetry can be found by x = -b/2a b =40 a = 5
11) x and y add with the 90 angle to form a straight line, so x+ y = 90
AND they are in a ratio of 3:2 so x is 3/(3+2) * 90 and y is 2/(3+2) *90
12) ALL of the angles 4z and 3y and 6x are the same value : 108
4z = 108 3y = 108 6x = 108
15000 = 20 t^2 + 135t + 3050 is '3050' correct? And I assume that is 135 t not 135 +
I think so....hit the 2nd button upper left.... one of the buttons on the R is marked MOD
40 people
c = # children cost 11c
a = #adult = 40 -c cost 20 (40-c) summed = 728
11c + 20(40-c) = 728 solve for c then a = 40 - c
34 miles past the egg farm + 12 miles from egg farm = 46 miles between the two trains
they are closing at 110 - 85 = 25 miles per hour
46 miles / 25 m/hr = 1.84 hrs when they meet
y = -5/3 x + 6 switch the x and y then solve for y
x = -5/3 y + 6
y = - 3/5 (x-6)
AREArighttriangle = 1/2 b * h = 1/2 * 6 * 6 = .............. units2