A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.

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

7c + x = 2
x = 2 - 7c

then substitute the result (2 - 7c) into the second equation:

-5c - 8(2 - 7c) = -7
-5c + (-8 x 2) + (-8 x -7c) = -7
-5c - 16 + 56c = -7
-5c + 56c = -7 + 16
51c = 9
c = \( \frac{9}{51} \)
c = \(\frac{3}{17}\)

A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r²h and the surface area is 2(π r²) + 2π rh.

A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.

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.

3a⁴ - 2a⁴ = 1a⁴