"A. 4x^4 is the answer so try that."
First add 5 to right side

Next , to cancel the 7, you need to multiply by 7 on both sides
The equation would be 30+3m=162 then you solve the problem
Answer:
B? I think
Step-by-step explanation:
sorry I really want to help but I dont get what the question is asking
Answer:
13.18651685
13.9
Explain:
890-238=652
652/890=0.7325842697 (Find out the percentage)
We know that 1 gram of Element X will be fully decayed in 18 minutes and half of it in 9 minutes.
0.7325842697x18=13.18651685
As you see 18/13.18651685 will equal to 18 (not exactly since it is rounded)
And of course we need to round it to nearest tenth. So the answer would be 13.9!