7) x = 12 and the side lengths are all 23
9) x=19, AB=BC=98, AC=125
10) x=14, GI=HI=39, GH=17
STEP - BY - STEP EXPLANATION
What to find?
An expression for the total number of books.
Given:
Number of shelves = 5
Number of books in each shelf = k
If Lucy has a bookcase with 5 shelves and each of this
shelf has k books, then the total number of books can be determine by multiplying the numbers of book by the numbers of shelves.
That is;

ANSWER
5K
If you have a calculator click stat edit and put in the info
Answer:
i think 5
Step-by-step explanation:
Answer:
Step-by-step explanation:
Given that during the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%
H0: Proportion did not change
Ha: Proportions changed
5% significance level is used
ABC CBS NBC INDEP TOTAL
percent 29 28 25 18 100
OBSERVED 90 77 83 50 300
Expected 87 84 75 54 300
chi square 0.103448276 0.583333333 0.853333333 0.296296296 1.836411239
df 3
p value 0.6071
Since p > alpha, we accept null hypothesis
The observed values are as per the proportions.