Answer:
x=2.202545727
Step-by-step explanation:
Use the Law of Sines:
a=b(sinα
/sinβ)
3x+12=(x+25)(sin40
/sin70)
3x+12=(x+25)(0.6840402867)
3x+12=0.6840402867x+17.10100717
2.315959713x+12=17.10100717
2.315959713x=5.10100717
x=2.202545727
So x=2.202545727
