Martin has x cards
christian has one card more then the double of martin
emilie has the triple of cards of christian
together they have 193 cards
how many cards do each of them have ?

4+6x-3x^3 in standard form with explanations because i don’t understand

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters

Write the equation of the circle centered at (10,-2) with radius 2