Answer:
Pythagoras theorem.
hypotenuse²=height²+base²
x²=15²+12²
x²=225+144
x²=329
x=329½
x=19.20
Answer:
15/56
Step-by-step explanation:
3*5=15 * 8*7=56
15/56
2 1/2 hours = 5/2 hours
He spent 1/5 of that time
5/2 x 1/5 = 1/2
1/2 of an hour is 30 minutes
You spent 30 minutes writing your blog
Answer:
sqrt 51
Step-by-step explanation:
You should use the pythagorean theorem, which states a^2+b^2=c^2. So the missing side length for the smaller triangle is sqrt{2^2+3^2}=sqrt{4+9}=sqrt{13}. And the side length x is sqrt{8^2-sqrt{13}^2}=sqrt{64-13}=sqrt{51}