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Mila [183]
2 years ago
7

During the recital, the pianist played for 1/4 of an hour. This was 1/8 of the

Mathematics
1 answer:
denis-greek [22]2 years ago
4 0

Answer:

1/32

Step-by-step explanation

(1) (1)

____     =   1/32

(4) (8)

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Need help.................
sergeinik [125]
First set up a proportion
240/160 = 320/200
Cross multiply and if the left equals the right it is similar.

5 0
3 years ago
Lydia and Claudia have the same number of charms in their collections. Lydia started with 6 charms and bought 3 more packs. Clau
serious [3.7K]

Answer:

E. 3x + 6 = 2x + 9

Step-by-step explanation:

The total number of charms that Lydia has in term of x

6 + 3x

The total number of charms that Claudia has in term of x

9 + 2x

Since they have the same number of charms, we can set these 2 equations above equals to each other

6 + 3x = 9 + 2x

x = 9-6 = 3

So E is the correct answer

7 0
3 years ago
Suppose John is a high school statistics teacher who believes that watching many hours of TV leads to lower test scores. Immedia
Hatshy [7]

This question is incomplete, the complete question is;

Suppose John is a high school statistics teacher who believes that watching many hours of TV leads to lower test scores. Immediately after giving the most recent test, he surveyed each of the 24 students in his class and asked them how many hours of TV they watched that week. He then matched each student's test grade with his or her survey response. After compiling the data, he used hours of TV watched to predict each student's test score. He found the least-squares regression line to be y"  = -1.5x + 85.

He also calculated that the value of r, the correlation, was -0.61.

what is the correct value of the coefficient of determination R² and give a correct interpretation of its meaning

Answer:

Interpretation of coefficient of determination R² = 0.3721

R² = 0.3721, meaning 37.21% of the total variation in test scores can be explained by the least square regression line

Step-by-step explanation:  

Given the data in the question;

the least square regression line is;

y"  = -1.5x + 85

the correlation coefficient r = -0.61

Now, the coefficient of determination R² is square of correlation coefficient r

R² = -61²

R² = 0.3721

8 0
3 years ago
3x - y - 3z if x = -2, y = 1, and z = -2.
dimaraw [331]
3(-2) -(1) -3(-2)
= -6 -1 +6 = -1
7 0
3 years ago
Read 2 more answers
kAITLIN EANRS $6.50 FOR EACH HOUR SHE WORKS. ON FRIDAY SHE WORKED FOR 3 HOURS. SHE ALSO WORKED ON SATURDAY. IF SHE EARNED A TOTA
Stella [2.4K]
She worked for five hours on Saturday.

Step by step: 3 hours × $6.50= $19.50

then take the amount of money she made in total and subtract what she made on Friday to find how much she made on Saturday

$52 - $19.50= $32.50

Now take how much she made on Saturday and divide that by $6.50 to find how many hours she worked on Saturday

$32.50 ÷ $6.50= 5 hours
5 0
3 years ago
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