To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

7a⁸ + 3a⁸ = 10a⁸

An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.

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

3c + z = 7
z = 7 - 3c

then substitute the result (7 - 3c) into the second equation:

3c - 9(7 - 3c) = 2
3c + (-9 x 7) + (-9 x -3c) = 2
3c - 63 + 27c = 2
3c + 27c = 2 + 63
30c = 65
c = \( \frac{65}{30} \)
c = 2\(\frac{1}{6}\)

The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:

c = πd
c = π(2 * r)
c = π(2 * 7)
c = 14π

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