What is the first step in solving the quadratic equation x2 – 40 = 0?

taking the square root of both sides of the equation
adding 40 to both sides of the equation
squaring both sides of the equation
subtracting 40 from both sides of the equation

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

You download a video game to your computer. you have a 60-minute free trial of the game. it takes 5 1/6 minutes to set up the game 7 1/3 minutes to play each level. you want to find out how many levels you can play for free.which inequality describes the number of levels, l, you can play in 60 minutes? can you play 6 levels during your free trial? i need ,

According to the number line, what is the distance between points a and b? v ++ + + + + -16 -14 -12 -10 -8 + 6 + 4 + -2 + 0 + 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 o6 units o 7 units 12 units o 14 units