The difference of two numbers is 18 . Their sum is 66 . What are the numbers?

2) \( a-5-b ; \) use \( a=10 \), and \( b=4 \)

1) \( y \div 2+x ; \) use \( x=1 \), and \( y=2 \)

\( z(x+y) ; \) use \( x=6, y=8 \), and \( z=6 \)

Determinar si es falso o verdadero: Sean \( H_{1} \) y \( H_{2} \) subespacios de un espacio vectorial \( V \). Entonces \( H_{1} \cap H_{2} \) es un subespacio de \( V \).

A bus driver has a tax credit of \( € 60 \) a week and pays income tax on all his wages standard rate of \( 20 \% \). If he pays \( € 140 \) in income tax for the week, find his gross weekly wage.