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vodomira [7]
3 years ago
11

Joanna needs a book to prop up a table leg. She randomly selects a book , and selects another book . What is probability that sh

e will choose 2 math books? If there are 17 books and 8 are math
Mathematics
1 answer:
Stolb23 [73]3 years ago
3 0
Id say 40%
because 8 are math so 9 of them are other 
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Hey can you please help me posted picture of question
kakasveta [241]
We have the following equation:
 3x2 + 7x + 4 = 0
 Using the resolver we have:
 x = (- b +/- root (b2 - 4ac)) / 2a
 Substituting values we have:
 x = (- (7) +/- root ((7) 2 - 4 (3) (4))) / 2 (3)
 Rewriting:
 x = (- 7 +/- root (49 - 48)) / 6
 x = (- 7 +/- root (1)) / 6
 x = (- 7 +/- 1) / 6
 The results are:
 x = (- 7 + 1) / 6 = -6/6 = -1
 x = (- 7 - 1) / 6 = -8 / 6 = -4/3
 Answer:
 
x = -1
 
x = -4/3
 
option C and D
8 0
3 years ago
Read 2 more answers
If the fuel tank in Jim's car holds 14 gallons of fuel, define a formula to determine the number of gallons of fuel in Jim's fue
salantis [7]

Considering that the car does 50 miles per gallon, the linear function for the number of gallons of fuel in Jim's fuel tank, n, in terms of the number of miles x that Jim has driven since filling his tank is given by:

y = -0.02x + 14

<h3>What is a linear function?</h3>

A linear function is modeled by:

y = mx + b

In which:

  • m is the slope, which is the rate of change, that is, by how much y changes when x changes by 1.
  • b is the y-intercept, which is the value of y when x = 0.

In this problem:

  • Jim's car holds 14 gallons of fuel, hence b = 14.
  • Considering it does 50 miles per gallon, and the amount in the tank will decrease, the slope is m = -\frac{1}{50} = -0.02.

Hence, the function is:

y = -0.02x + 14

You can learn more about linear functions at brainly.com/question/25898120

5 0
2 years ago
Employees at a company are given £1,200 to spend on items for the office.
umka21 [38]

Answer:

380

Step-by-step explanation:

280 coffe machine

15 bag multiple for 40= 600 - 15%= 540

540+280=820

1200-820=380

3 0
3 years ago
Which equation shows the variable terms isolated on one side and the constant terms isolated on the other side for the equation
olchik [2.2K]

Answer: x= 1

Step-by-step explanation: solve for  x  by simplifying both sides of the equation, then isolating the variable.

7 0
3 years ago
At the beginning of an experiment, the temperature of a solution was 48°C. During a 6-hour
ExtremeBDS [4]

9514 1404 393

Answer:

  • -2.2(6) +1.8(4) . . . temperature change
  • 42 °C

Step-by-step explanation:

At the end of the first 6 hours, the temperature change was ...

  (-2.2 K/h)(6 h) = -13.2 K

The change in the next 4 hours was ...

  (1.8 K/h)(4 h) = 7.2 K

Then the total change over the 10-hour period was ...

  (-2.2)(6) +(1.8)(4) . . . . . expression for temperature change

This evaluates to -13.2 +7.2 = -6.

__

The final temperature is the sum of the initial temperature and the temperature change:

  final temperature = 48 °C -6 °C = 42 °C

_____

<em>Additional comment</em>

When temperature is measured on the Celsius scale, a change of 1 degree is called a kelvin (K).

8 0
3 years ago
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