Answer:
3.9
Step-by-step explanation:
a^2+b^2=c^2
a^2+7^2=10^2
a^2+49=100
100-49=a^2
[tex]\sqrt{51}[/tex]=a
x^2+6^2=a^2
x^2+36=[tex]\sqrt{51}[/tex]^2
x^2+36=51
51-36=x^2
15=x^2
[tex]\sqrt{15}[/tex]=x
x=3.9
