Helppp please 20 points for that ​

Step-by-step explanation:

a^2 + b^2 = c^2

7^2 + b^2 = 13^2

b = square root of 120

x=5sq rt 6   or 12.25

Step-by-step explanation:

(5sq rt 13)^2=x^2+(5sq rt 7)^2

325=x^2+175

x^2=150

x=5sq rt 6   or 12.25

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.