Answer:

Step-by-step explanation:
1) Expand.

2) Simplify 7a + 5a + 15 to 12a + 15.

3) Simplify 8a + 4a + 8 to 12a + 8.

4) Cancle 12a from both sides.

5) Since 15 = 8 is false, there's no solution.

Therefor, this equation has no solution.
Answer:
-605
Step-by-step explanation:
Answer:
Option (a) is correct.
is a perfect cube.
Step-by-step explanation:
Given : Some Monomial
We have to choose out of given monomial that is a perfect cube.
Perfect cubes are numbers that can be written as 
So, consider
, we know 1 can be written as 
Thus,
can be written as 
Thus, Option (a) is correct.
Answer:
140r2
Step-by-step explanation:
Refer to the diagram shown below.
Because ACFD is a parallelogram, its opposite angles are equal. Therefore
x = m∠ACF = m∠BCF = 48°
Similarly,
y = m∠CAD = m∠CFD
The sum of the angles inside a parallelogram is 360°. Therefore
48° + x + y + y = 360°
Because x = 48°,
48° + 48° + 2y = 360°
2y = 360° - 96° = 264°
y = 132°
Because ABED and FEBC are congruent, therefore
y = m∠DAB = m∠CFE = 132°
x = m∠ADE = m∠FCB = 48°
Because FEBC is a parallelogram, the opposite angles are equal. Therefore
m∠CBE = m∠CFE = y = 132°
m∠BCF = m∠BEF = x = 48°
Answer:
The measures of all angles of trapezoid FEBC are
m∠BCF = 48°
m∠BEF = 48°
m∠CBE = 132°
m∠CFE = 132°