Can someone help me with factor

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

If a =6, what is the value of 2a(3b + 5c)?

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)