Question

substitute the given values into the given formula and solve for the unknown variable. if necessary, round to one decimal place. p = a + b + c; p = 28, a = 6, b = 9 (perimeter of a triangle) c = \square

Explanation:

Step1: Substitute known values

We know \( P = 28 \), \( a = 6 \), and \( b = 9 \). Substitute these into the formula \( P=a + b + c \), so we get \( 28=6 + 9 + c \).

Step2: Simplify and solve for \( c \)

First, calculate \( 6 + 9=15 \). Then the equation becomes \( 28 = 15 + c \). To solve for \( c \), subtract 15 from both sides: \( c=28 - 15 \).

Step3: Calculate the result

\( 28-15 = 13 \), so \( c = 13 \).

Answer:

\( c = 13 \)