Answer:
1-12x=-20-9x
-12x=-21-9x
-3x=-21
divide both sides by -3
x=-7
Step-by-step explanation:
The area of triangle B is 10.5 square units.
The area of triangle C is 10 square units.
Step-by-step explanation:
Step 1:
The area of a triangle is half the product of its base length and height.
The base is the lower end of the triangle and its length is called base length.
The length from the base to the highest point on the triangle is the height.
Step 2:
For triangle B, the base extends for a length of 7 units and the height is 3 units.
The area of triangle B 
So the area of triangle B is 10.5 square units.
Step 3:
For triangle C, the base extends for a length of 5 units and the height is 4 units.
The area of triangle C 
So the area of triangle C is 10 square units.
The correct simplification of the given expression is (B)
.
<h3>
What is an expression?</h3>
- An expression or mathematical expression is a finite combination of symbols that is well-formed according to context-dependent norms.
To find the correct simplification of the given expression:
- The easiest terms to check are the first (8x)(2x²) = 16x³ and the last (-5)(-6) = 30.
- This check eliminates the first choice.
- The remaining choices differ only in the sign and coefficient of the squared term, so that is the one we need to find.
- The squared term will be the sum of the products of factors whose degrees total 2:

Therefore, the correct simplification of the given expression is (B)
.
Know more about expressions here:
brainly.com/question/723406
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The correct question is given below:
Choose the correct simplification of the expression (8x − 5)(2x2 − 5x − 6). (1 point)
(A) 16x3 − 50x2 − 23x − 30
(B) 16x3 − 50x2 − 23x + 30
(C) 16x3 − 30x2 − 23x + 30
(D) 16x3 + 50x2 − 23x + 30
The expression -4 (-11 + 4n) – 3(- 2n + 9) is equivalent to the expression 17 — 10n.
<h3>What is an equivalent expression?</h3>
The equivalent is the expressions that are in different forms but are equal to the same value.
The expression is given below.
⇒ -4 (-11 + 4n) – 3(- 2n + 9)
On simplifying, we have
⇒ 44 – 16n + 6n – 27
⇒ 17 — 10n
More about the equivalent link is given below.
brainly.com/question/889935
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The answer is simply 9 :)