To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the > sign and the answer on the other.

4a - 1 > \( \frac{a}{-5} \)
-5 x (4a - 1) > a
(-5 x 4a) + (-5 x -1) > a
-20a + 5 > a
-20a + 5 - a > 0
-20a - a > -5
-21a > -5
a > \( \frac{-5}{-21} \)
a > \(\frac{5}{21}\)

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.

A trapezoid is a quadrilateral with one set of parallel sides.

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.

7c + 6 = \( \frac{c}{-5} \)
-5 x (7c + 6) = c
(-5 x 7c) + (-5 x 6) = c
-35c - 30 = c
-35c - 30 - c = 0
-35c - c = 30
-36c = 30
c = \( \frac{30}{-36} \)
c = -\(\frac{5}{6}\)

A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.