Create similar triangles
theres no b
$a^2 - b^2 = 0$
$a = b$
$5 \cdot 1 = 5$ ways
sum: 0.749999999...
let x = 0.749999999...
100x = 74.999999999999...
1000x = 749.999999999999...
900x = 675
x = 675/900
x = 3/4
16+9-3=25-3=22
first 5 meaning he rolls the number 5, or rolls 5 times?
floor(r) + 2r = 12.2
12 < 3r < 13
4 < r < 4.6...
0.2÷2 = 0.1
0.1 for each of the r
given interval (4, 4 2/3) we have r = 4.1
$2x^2 - 5x - 4 = 2x + 3$
$2x^2 - 7x - 7 = 0$
Discriminant = $(-7)^2 - 4(2)(-7) = 49 - (-56) = \boxed{105}$
Rearrange:
$2x + 5y = -8$
$6x + 15y = 16 + a$
Note: $6x + 15y = 3(2x + 5y)$
Multiply equation 1 by 3: $6x + 15y = -24$
An equation have a = - (16 - (-24) )= -40
