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2 answers:
<h2><u>Question</u></h2>
Molly has 18 coins, all dimes and nickels. The total value of the coins
is $1.05. How many of each type of coin does Molly have?
<u></u>
15 nickels
3 dimes
Let d represent the number of dimes
Molly has. Then she has 18-d nickels, and
the total value (in cents) of her coins is ..
5(18-d) +10d = 105
5d +90 105.... simplify
5d 15...
. . subtract 90
d 3.. ... divide by 5; number of
dimes
18-d 15... . . number of nickels
<u>Molly has 3 dimes and 15 nickels.</u>
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The true statements are:
- 44/85 of the student surveyed do not ride the bus to school
- About 32% of the students are in the 9th grade
The false statements are:
- 64% of the students are 11th graders
- 134/150 of the students surveyed are in 9th or 10th grade
<u>The students that do not ride bus to school</u>
From the table, 220 students do not ride bus to school.
So, the proportion of students that do not ride bus to school is:
Simplify
Hence, this statement is true
<u>The 9th graders </u>
From the table, 134 students are 9th graders
So, the proportion of students that are 9th graders is:
Divide
Approximate, and represent as percentage
Hence, this statement is true
<u>The 11th graders </u>
From the table, 141 students are 11th graders
So, the proportion of students that are 11th graders is:
Divide
Approximate, and represent as percentage
Hence, this statement is false
<u>The 9th or 10th graders </u>
From the table, 134 + 150 students are 9th or 10th graders
So, the proportion of students that are 11th graders is:
Hence, this statement is false
Read more about two-way frequency table at:
It’s y intercept is -14 and crosses the x axis at 6
