Let the number is $\"\"$ .

Three times the square of a number is $\"\"$

And 7 times the number is $\"\"$ and minus $\"\"$ is equal to $\"\"$

Find the number.

The equation is $\"\"$

Solve the equation.

$\"\"$

The circumference of a rightangles triangle is $\"\"$

The hypotenuse is $\"\"$

And the one rightangled side is $\"\"$

Find the lengths of the rightangle longer side.

Formula for circumference of a right-angles triangle is $\"\"$

Substitute $\"\"$

$\"\"$

The right angle longer side length is $\"\"$