3. Find x in AABC. C 4 16 X A B a. 8 b. 10 c. 20 d. 64
1 answer:
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Answer:
b = 10
Step-by-step explanation:
The area (A) of a triangle is calculated as
A = bh ( b is the base and h the height )
Here h = 3x + 15 and A = 15x + 75, thus
× b × (3x + 15) = 15x + 75
Multiply both sides by 2 to clear the fraction
b(3x + 15) = 30x + 150
Divide both sides by (3x + 15)
b = ← factor numerator and denominator
= ← cancel the factor (x + 5) on numerator/denominator
=
= 10
Mark and Don have to sell 11 and 59 marbles respectively.
<em><u>Explanation</u></em>
Lets assume, the number of marbles Mark has is
As, Don has 4 more than 5 times the number of marbles mark has, so the number of marbles Don has
Question says that the total number of marbles is 70. So, the equation will be...
<em>So, the number of marbles Mark has = 11 </em>
<em>and the number of marbles Don has = </em>