A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.

You need to find the value of c so solve the first equation in terms of z:

3c + z = 1
z = 1 - 3c

then substitute the result (1 - 3c) into the second equation:

c + 3(1 - 3c) = 8
c + (3 x 1) + (3 x -3c) = 8
c + 3 - 9c = 8
c - 9c = 8 - 3
-8c = 5
c = \( \frac{5}{-8} \)
c = -\(\frac{5}{8}\)

A rectangle is a parallelogram containing four right angles. Opposite sides (a = c, b = d) are equal and the perimeter is the sum of the lengths of all sides (a + b + c + d) or, comonly, 2 x length x width. The area of a rectangle is length x width. A square is a rectangle with four equal length sides. The perimeter of a square is 4 x length of one side (4s) and the area is the length of one side squared (s²).

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

2a x 5b = (2 x 5) (a x b) = 10ab