Answer:
$1.73
Step-by-step explanation:
$7.89-$6.16=$1.73
2.1 kilometers
Pythagoras' Theorem
a^2 + b^2 = c^2
2^2 + b^2 = 2.9^2
2.9^2 - 2^2 = b^2
8.41 - 4 = 4.41
b = √4.41
b= 2.1
1, 3, 17, 51
1 X 51 = 51
3 X 17 = 51
1.8
18
b
