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
denis-greek [22]
3 years ago
15

Gemma, a scuba diver, begins a dive on the side of a boat 4 feet above sea level. She descends 28 feet. Which integer represents

Gemma’s position with respect to sea level?
Mathematics
2 answers:
MrRa [10]3 years ago
8 0

Answer:

-24

Step-by-step explanation:

ANEK [815]3 years ago
4 0

-24

Step-by-step explanation:

You might be interested in
A package of ground beef costs $6.98 . The price per pound is $3.86.How many pounds of ground beef are in the package? Round to
ad-work [718]
Well it seems if you round  you would get 1.81 try it
7 0
3 years ago
A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than ex
Roman55 [17]

Answer:

 Standard error (S.E) =  0.048  ≅ 0.05

Step-by-step explanation:

<u>Explanation</u>:-

Given  sample size 'n'=76

Given the dean who randomly selects 76 students and finds that 58 out of 76 are receiving financial aid.

Sample proportion

                         p = \frac{x}{n} = \frac{58}{76} = 0.7631

The standard error is determined by

                     S.E = \sqrt{\frac{p(1-p)}{n} }

                     S.E = \sqrt{\frac{0.763(0.2369}{76} }

  Standard error is 0.048  ≅ 0.05

3 0
3 years ago
When electricity (the flow of electrons) is passed through a solution, it causes an oxidation-reduction (redox) reaction to occu
oee [108]

Answer:

a. 135 g

b. 60.6 min

Step-by-step explanation:

a. What mass of Cu(s) is electroplated by running 28.5 A of current through a Cu2+ (aq) solution for 4.00 h? Express your answer to three significant figures and include the appropriate units.

The chemical equation for the reaction is given below

Cu²⁺(aq) + 2e⁻ → Cu(s)

We find the number of moles of Cu that are deposited from

nF = It where n = number of moles of electrons, F = Faraday's constant = 96485 C/mol, I = current = 28.5 A and t = time = 4.00 h = 4.00 × 60 min/h × 60 s/min = ‭14,400‬ s

So, n = It/F = 28.5 A × ‭14,400‬ s/96485 C/mol = ‭410,400‬ C/96485 C/mol = 4.254 mol

Since 2 moles of electrons deposits 1 mol of Cu, then 4.254 mol of electrons deposits 4.254 mol × 1 mol of Cu/2 mol = 2.127 mol of Cu

Now, number of moles of Cu = n' = m/M where m = mass of copper and M = molar mass of Cu = 63.546 g/mol

So, m = n'M

= 2.127 mol × 63.546 g/mol

= 135.15 g

≅ 135 g to 3 significant figures

b. How many minutes will it take to electroplate 37.1 g of gold by running 5.00 A of current through a solution of Au+(aq)?

The chemical equation for the reaction is given below

Au⁺(aq) + e⁻ → Au(s)

We need to find the number of moles of Au in 37.1 g

So, number of moles of Au = n = m/M where m = mass of gold = 37.1 g and M = molar mass of Au = 196.97 g/mol

So, n = m/M = 37.1 g/196.97 g/mol = 0.188 mol

Since 1 mol of Au is deposited  by 1 moles of electrons, then 0.188 mol of Au deposits 0.188 mol of Au × 1 mol of electrons/1 mol of Au = 0.188 mol of electrons

We find the time it takes to deposit 0.188 mol of electrons that are deposited from

nF = It where n = number of moles of electrons, F = Faraday's constant = 96485 C/mol, I = current = 5.00 A and t = time

So, t = nF/It

= 0.188 mol × 96485 C/mol ÷ 5.00 A

= ‭18173.30‬ C/5.00 A

= 3634.66 s

= 3634.66 s × 1min/60 s

= 60.58 min

≅ 60.6 min to 3 significant figures

6 0
3 years ago
Hillary made 12 cupcakes james made 10 times as many as hillary how many cupcakes did james make
Llana [10]
    12
  x 10
______
120
it's pretty simply,sorry if I got it wrong,i'm kinda tired<span />
5 0
3 years ago
Read 2 more answers
Option 1: $30 an hour plus a nonrefundable deposit of $50
Aleks [24]

Answer:

to be honost i am in 8th grade but i realy like you and your the first person i like in a lot of time

Step-by-step explanation:


4 0
3 years ago
Other questions:
  • Find the Geometric mean x of 5 and 20
    15·1 answer
  • M-4=2m how to solve this
    6·2 answers
  • Explain how to write 45,100,000 in scientific notation.
    12·1 answer
  • Help, I'm sort of confused. Find the percent error. Round to the nearest whole percent if necessary. Each week, Mr. Jones goes t
    9·2 answers
  • For Triangle PQM, where M is the Right Angle and PQ is the Hypotenuse. You know side PM = 8, side PQ = 17, Side MQ = 15. Find An
    8·1 answer
  • Which of the following is less than 0.625?<br>A. 0.623<br>B. 0.651<br>C. 0.627<br>D. 1.624<br><br>​
    6·2 answers
  • (GIVING BRAINLIEST!!!)
    14·1 answer
  • Evaluate 4y when y = 5
    9·1 answer
  • If f(x) = 3x - 1 and g(x) = x + 2, find (f+g)(x)​
    12·1 answer
  • Devide 30% by 100 and remove the percent sign to convert From a percent to a decimal show me the solution
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!