I don't know the answer sorry,
Answer:
- 
Step-by-step explanation:
Rationalise the denominator by multiplying the numerator/ denominator by the conjugate of the denominator
the conjugate of
+ 5 is
- 5, hence
12 / (
+ 5) × (
- 5 ) / (
- 5)
= (12
- 60 ) / - 18
=
- 
Answer:
3x, -4, 2x, 6
Step-by-step explanation:
<span>1. Each bike has 2 pedals and 2 wheels;
2. Each tricycle has 2 pedals and 3 wheels;
3. Let x be the number of bikes and, y the number of tricycles;
4. 2x + 3y = 117 and 2x + 2y = 104 => ( </span>2x + 3y ) - ( 2x + 2y ) = 117 - 104 => y = 13 => 2 * x + 2 * 13 = 104 => 2 * x = 104 - 26 => 2 * x = 78 => x = 78 / 2 => x = 39.