X=13 I say.................
Answer:15x
Step-by-step explanation:you add 12 + 3 which equals 15 and then you just carry the x over
Well you never sent a picture but the most logical answer is 80 cm
The Answer would be x=72. Why? Because

is your %. You Cross multiply 240 * 30 = 100x
240 time 30 = 7200. you want x to be alone so you do 7200 divided by 100 equaling 72. So you get x=72.
The answer is D. 3 and 17.
3 + 17 = 20. They have a sum of 20.
17 - 3 = 14. They also have a difference of 14.
Hope I helped!