<h3><u>Part A</u></h3>
factor the common term 'y' and '-4'
collect into groups
<h3><u>Part B</u></h3>
middle term split
factor the common term '3x' and '-2'
collect into groups
simplify the following
<h3>Answer: x = 50</h3>
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Explanation:
The angles shown are vertical angles. Any pair of vertical angles are always congruent (i.e. equal)
Set the two expressions equal to each other and solve for x.
2(x+10) = 3x-30
2x+20 = 3x-30 ... distribute
2x+20-2x = 3x-30-2x ... subtract 2x from both sides
20 = x-30
20+30 = x-30+30 ... add 30 to both sides
50 = x
x = 50
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Check:
Plug x = 50 into the equation. Both sides should result in the same value
2(x+10) = 3x-30
2(50+10) = 3*50-30
2(60) = 3*50-30
120 = 150-30
120 = 120
The answer is confirmed.
Answer:
Lin has 11 acorns ⇒ answer D
He subtract 4 from 7 instead of add 4 to 7
Step-by-step explanation:
- Lin has 4 pinecones and some acorns
- She has 7 fewer pinecones than acorns
- The meaning of 7 fewer pinecones than acorns is the number of the
pinecones is less than the number of acorns by 7
∵ She has 4 pinecones
∵ She has 7 fewer pinecones than acorns
- The number of pine cones is less than the number of acorns by 7
∴ 4 = number of acorns - 7
- Add 7 to both sides
∴ 11 = number of acorns
*<em> Lin has 11 acorns</em>
- Tom choose answer A which is 3
- He made a mistake in the equation
- He put ⇒ number of the acorns = 7 - 4 not 7 + 4
∴ number of acorns = 3
* <em>He subtract 4 from 7 instead of add 4 to 7</em>
Sorry, i don't understand