Answer:
k = 77
Step-by-step explanation:

Answer:
z= -16/19
Multiply both sides by 2z+1
Then subtract20z on both sides
Add 6 on both sides
Divide by -19
She did everything correct in step 1 and 2
Until step 3 she took a wrong turn.
She wrote seven times x over seven = twenty-three over 7
When she should have wrote..
negative seven times x over negative seven = twenty-three over negative seven
So her answer was
23/7
while it should have been a negative. -> -23/7
Good Luck! :)
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these are the right answers. i just plugged the numbers into my calculator:)
The correct answer is C. 49.
Remember that there are 100 students divided into 7-12 and 13-18 age group. So there should be 50 for each. The table should go like this:
7-12 age group
23 adventure or biography
27 - detective
so you just have to subtract 50 from 23, which makes it 27. The remaining belongs to the 13-18 age group.
13-18 age group
1 - detective
49 - adventure or biography.