1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vodka [1.7K]
4 years ago
13

What is the answer to -11b+7=40?

Mathematics
2 answers:
Andrews [41]4 years ago
4 0

Hey there!

-11b + 7 = 40

  • SUBTRACT by 7 on each of your sides.

-11b + 7 - 7 = 40 - 7

Cancel out: 7 - 7 because that gives you 0

Keep: 40 - 7 because it helps us solve for our answer

40 - 7 = 33

  • DIVIDE both sides by -11

11b/-11 = 33/-11

Cancel out: -11b/-11 because it equals 1

Keep: 33/-11 because it gives you -3

33/-11 = 33 ÷ -11 = 3

<h3><u>b</u><u> = -3 </u></h3>

Good luck on your assignment and enjoy your day!

~LoveYourselfFirst:)

denis-greek [22]4 years ago
4 0

Answer:

b = -3

Step-by-step explanation:

<u>Step 1:  Subtract 7 from both sides</u>

-11b + 7 - 7 = 40 - 7

-11b = 33

<u>Step 2:  Divide both sides by -11</u>

<u />-11b / -11 = 33 / -11

b = -3

Answer:  b = -3

You might be interested in
Mode and median mean and range of <br><br> 14,19,16,13,16,14
valentinak56 [21]
Mean = 15 1/3
Median = 15
Mode = 14,16
Range = 6
5 0
3 years ago
Solve the system of equations below by graphing both equations with a
jek_recluse [69]
Your answer would be c
6 0
3 years ago
A researcher examines 27 water samples for iron concentration. The mean iron concentration for the sample data is 0.802 cc/cubic
Delvig [45]

Answer:

90% confidence interval for the population mean iron concentration is [0.771 , 0.832].

Step-by-step explanation:

We are given that a researcher examines 27 water samples for iron concentration. The mean iron concentration for the sample data is 0.802 cc/cubic meter with a standard deviation of 0.093.

Firstly, the pivotal quantity for 90% confidence interval for the population mean iron concentration is given by;

         P.Q. = \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1

where, \bar X = sample mean iron concentration = 0.802 cc/cubic meter

             s = sample standard deviation = 0.093

             n = number of water samples = 27

             \mu = population mean

<em>Here for constructing 90% confidence interval we have used t statistics because we don't know about population standard deviation.</em>

So, 90% confidence interval for the population mean, \mu is ;

P(-1.706 < t_2_6 < 1.706) = 0.90  {As the critical value of t at 26 degree of

                                                 freedom are -1.706 & 1.706 with P = 5%}

P(-1.706 < \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } < 1.706) = 0.90

P( -1.706 \times {\frac{s}{\sqrt{n} } } < {\bar X - \mu} < 1.706 \times {\frac{s}{\sqrt{n} } } ) = 0.90

P( \bar X -1.706 \times {\frac{s}{\sqrt{n} } < \mu < \bar X +1.706 \times {\frac{s}{\sqrt{n} } ) = 0.90

<u>90% confidence interval for</u> \mu = [ \bar X -1.706 \times {\frac{s}{\sqrt{n} } , \bar X +1.706 \times {\frac{s}{\sqrt{n} } ]

                                                 = [ 0.802 -1.706 \times {\frac{0.093}{\sqrt{27} } , 0.802 +1.706 \times {\frac{0.093}{\sqrt{27} } ]

                                                 = [0.771 , 0.832]

Therefore, 90% confidence interval for the population mean iron concentration is [0.771 , 0.832].

4 0
3 years ago
Allen's daily regular wage is P1,420. This coming Christmas, his boss is asking him to work for 14 hours. How much is his DAILY
VMariaS [17]

Using proportions, it is found that his DAILY RATE on that particular day is of Php 2,420 .

  • This question is solved by proportions, using a <em>rule of three.</em>
  • In a regular 8-hour day, Allen earns Php 1420. How much will he earn on a 14 hour day?

The <em>rule of three</em> is:

8 hours - Php 1420

14 hours - x

Applying cross multiplication:

8x = 1420 \times 14

x = \frac{1420 \times 14}{8}

x = 2485

The closest option is Php 2,420.

A similar problem is given at brainly.com/question/24372153

7 0
3 years ago
Exercise 8.8. Our faucet is broken, and a plumber has been called. The arrival time of the plumber is uniformly distributed betw
Nataliya [291]
The answers is 4:30 I hope it helps
4 0
3 years ago
Other questions:
  • How to answer x+3y=12
    15·1 answer
  • Steven, Linda, and Elliott check their lunch
    8·1 answer
  • Evaluate the expression 0.3(3-0.5)
    13·2 answers
  • The diameter of this compact disc is 11.8cm. The hole in the middle has a area of 1.54cm2. What is the area of the plastic in th
    12·1 answer
  • Which of the following expressions represents the phrase "the quotient of a number and -5"?
    9·1 answer
  • ANSWER THIS URGENT ANSWER THIS URGENT ANSWER THIS URGENT ANSWER THIS URGENT ANSWER THIS URGENT ANSWER THIS URGENT ANSWER THIS UR
    11·2 answers
  • Use the ratio of a 45-45-90 triangle to solve for the variables​
    10·2 answers
  • What the answer please​
    6·2 answers
  • What dose 2 + 2 = ?????????
    14·1 answer
  • Find the midpoint of the line segment joining the points ​R(​-4,3​) and ​S(​5,6​)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!