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Katena32 [7]
3 years ago
12

Yolanda is buying supplies for school. She buys n packages of pencils at $1.40 per package and m pads of paper at $1.20 each. Wh

at does each term in the expression 1.4n+ 1.2m represent? What does the entire expression represent?
Mathematics
1 answer:
OlgaM077 [116]3 years ago
4 0
1.4n will represent the price for (n) packs of pencils

1.2m will represents the price for (m) packs of paper

1.4n+1.2m as a whole, will represent her total cost.
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PLEASE PLEASE HELP I WILL GIVE BRAINALSIT
Virty [35]

Answer:

$33 for 11 packs of paper

6 0
2 years ago
On any given day, the probability that a large local river is polluted by carbon tetrachloride is 0.12. Each day, a test is cond
babymother [125]

Answer:

a) 0.2416

b) 0.4172

c) 0.0253

Step-by-step explanation:

Since the result of the test should be independent of the time , then the that the test number of times that test proves correct is independent of the days the river is correct .

denoting event a A=the test proves correct and B=the river is polluted

a) the test indicates pollution when

- the river is polluted and the test is correct

- the river is not polluted and the test fails

then

P(test indicates pollution)= P(A)*P(B)+ (1-P(A))*(1-P(B)) = 0.12*0.84+0.88*0.16 = 0.2416

b) according to Bayes

P(A∩B)= P(A/B)*P(B) → P(A/B)=P(A∩B)/P(B)

then

P(pollution exists/test indicates pollution)=P(A∩B)/P(B) = 0.84*0.12 / 0.2416 = 0.4172

c) since

P(test indicates no pollution)= P(A)*(1-P(B))+ (1-P(A))*P(B) = 0.84*0.88+  0.16*0.12 = 0.7584

the rate of false positives is

P(river is polluted/test indicates no pollution) = 0.12*0.16 / 0.7584 = 0.0253

4 0
3 years ago
A $25,000 purchase decreases 12% in value per year. Determine the values of the purchase after 3 years and after 7 years.
choli [55]
Use Socratic or slider
4 0
3 years ago
Read 2 more answers
Paul is taking inventory of unsold ladies’ dresses from last month. The following matrix shows how many of each dress were left
Allisa [31]

Answer:

A

Step-by-step explanation:

Just add both matrices

5 0
3 years ago
Read 2 more answers
The midpoint of AB is M(1, -4). If the coordinates of A are (-3,-6), what are the coordinates of B?
kramer

Answer:

The coordinates of B is (5,-2)

Step-by-step explanation:

In order to find the coordinates of B, you have to use midpoint formula. Then substitute the following values into the formula :

m = ( \frac{x1 + x2}{2} , \frac{y1 + y2}{2} )

Let (x1,y1) be A (-3,-6),

Let (x2,y2) be B,

Let midpoint be M (1,-4),

(1, - 4) =  (\frac{ - 3 + x2}{2} , \frac{ - 6 + y2}{2} )

by \: comparison, \:

\frac{ - 3 + x2}{2}  = 1

- 3 + x2 = 2

x2 = 5

\frac{ - 6 + y2}{2}  =  - 4

- 6 + y2 =  - 8

y2 =  - 2

6 0
3 years ago
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