Answer:
Step-by-step explanation:
Use Pythagorean theorem,
Base² + altitude² =hypotenuse²
x² + 19² = 21²
x² + 361 = 441
x² = 441 - 361
x² = 80

Answer:
help with what? what is your q u e s t i o n
Step-by-step explanation:
Answer:
34.333... can
45.543... can
and 0.3497... cannot
Step-by-step explanation:
Answer:
the decimal expansion of 7/8 is
0.875
Answer:
a) 
b) Irrational
Step-by-step explanation:
a) Let 
Then 
Subtract (a) from (b)



b) From part a)
is a rational number but
is an irrational number.
But
is not a rational number because the product of a rational number and an irrational number is an irrational number.