Playing tennis burns energy at a rate of about 25 kj/min. cycling burns energy at about 35kj/min. hans exercised by playing tennis and then cycling. he exercised for 50 min altogether and used a total of 1450kj of energy. for how long did he play tennis?

answer: a clock

step-by-step explanation:

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.