Question

1 a triangle has side lengths of 15 centimeters, 11 centimeters, and 3.5x centimeters.
the perimeter is 75 centimeters.
a) some handwritten calculation steps b) some handwritten content

Explanation:

Step1: Sum sides equal to perimeter

$15 + 11 + 3.5x = 75$

Step2: Simplify the constant terms

$26 + 3.5x = 75$

Step3: Isolate the variable term

$3.5x = 75 - 26$
$3.5x = 49$

Step4: Solve for $x$

$x = \frac{49}{3.5}$

Answer:

$x = 14$