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3 years ago

I'm trying to figure out how much money I'm left with

Mathematics

1 answer:

Salsk061 [2.6K]3 years ago

6 0

the answer is 60.35, because the 70$ answer is how much you get after work, then the 62$ one is after you pay the 12$ for dinner but then the 60.35 is how much you’re left with after you leave the tip

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The Smiths spend 8% of their budget on entertainment. Their total budget this year is $2,000 more than last year, and this year

Marrrta [24]

Answer:

46000

Step-by-step explanation:

cuz I did the math

4 0

2 years ago

Read 2 more answers

HELP PLEASE!! what is the solution of the system ? y=-8x-2 and y=-6x+4

Illusion [34]

Answer: -3

Since the both equal the same value we can combine the into -8x-2=-6x+4.

From there you can solve from whatever side you want, and the answer is -3.

5 0

2 years ago

Simplify -3(2.5-k)+0.5(7+8k)

Vedmedyk [2.9K]

Answer:

-7•5+3k+3•5+4k

-7•5+3•5+4k+3k

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6 0

2 years ago

A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new

Anit [1.1K]

Answer:

predictive value of a positive test = 18.18%

predictive value of a negative test = 94.03%

Step-by-step explanation:

Sensitivity = 60% = 0.6

Specificity = 70% = 0.7

Let True Positive = TP

True Negative = TN

False Negative = FN

$Sensitivity = \frac{TP}{TP + FN} \\0.6 = \frac{TP}{TP + FN} \\0.6TP + 0.6FN = TP\\0.4TP = 0.6FN\\TP = 1.5 FN$

$Specificity = \frac{TN}{TN + FP} \\0.7 = \frac{TN}{TN + FP} \\0.7TN + 0.7FP = TN\\0.7FP = 0.3 TN\\TN = 7/3 FP$

Prevalence = 10% = 0.1

Three hundred people are screened, $T_{total} = 300$

Total number of people having the disease, $T_{disease} = ?$

$Prevalence = \frac{T_{disease} }{T_{total} } \\0.1 = \frac{T_{disease} }{300 }\\T_{disease} = 30$

$T_{disease} = TP + FN\\30 = TP + FN$

But TP = 1.5 FN

30 = 1.5 FN + FN

30 = 2.5 FN

FN = 30/2.5

FN = 12

TP = 1.5 FN = 1.5 * 12

TP = 18

$FP + TN = T_{total} - T_{disease} \\FP + TN = 300 - 30\\FP + TN = 270\\FP + \frac{7}{3} FP = 270\\\frac{10}{3} FP = 270\\FP = 27 * 3\\FP = 81$

81 + TN = 270

TN = 189

To calculate the Predictive value of positive test (PPT)

$PPT = \frac{TP}{TP + FP} * 100\\PPT = \frac{18}{18+81} * 100\\PPT = \frac{18}{99} * 100\\PPT = 18.18 \%$

To calculate the Predictive value of negative test (PNT)

$PPT = \frac{TN}{FN + TN} * 100\\PPT = \frac{189}{189+12} * 100\\PPT = \frac{189}{201} * 100\\PPT = 94.03 \%$

7 0

3 years ago

Find the surface area of this triangular prism. 3 cm 5 cm 11 cm 4 cm

blondinia [14]

Step-by-step explanation:

The area of a triangular pyramid is 5 cm.

5 0

2 years ago