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
olchik [2.2K]
3 years ago
5

What is the sum of -5/7 + 4/7? ​

Mathematics
2 answers:
LekaFEV [45]3 years ago
8 0

Answer:

1/7

Step-by-step explanation:

Brilliant_brown [7]3 years ago
4 0

Answer: -1/7

Step-by-step explanation: Since the fractions have the same denominator you can add them together without trying to have to change it

You might be interested in
You decide that coronavirus is really boring and decide to sign up for a subscription to Netflix you must pay intial cost of $20
aleksandrvk [35]
Answer:
y= 8.99x + 20
7 0
3 years ago
the half-life of chromium-51 is 38 days. If the sample contained 510 grams. How much would remain after 1 year?​
madam [21]

Answer:

About 0.6548 grams will be remaining.  

Step-by-step explanation:

We can write an exponential function to model the situation. The standard exponential function is:

f(t)=a(r)^t

The original sample contained 510 grams. So, a = 510.

Each half-life, the amount decreases by half. So, r = 1/2.

For t, since one half-life occurs every 38 days, we can substitute t/38 for t, where t is the time in days.

Therefore, our function is:

\displaystyle f(t)=510\Big(\frac{1}{2}\Big)^{t/38}

One year has 365 days.

Therefore, the amount remaining after one year will be:

\displaystyle f(365)=510\Big(\frac{1}{2}\Big)^{365/38}\approx0.6548

About 0.6548 grams will be remaining.  

Alternatively, we can use the standard exponential growth/decay function modeled by:

f(t)=Ce^{kt}

The starting sample is 510. So, C = 510.

After one half-life (38 days), the remaining amount will be 255. Therefore:

255=510e^{38k}

Solving for k:

\displaystyle \frac{1}{2}=e^{38k}\Rightarrow k=\frac{1}{38}\ln\Big(\frac{1}{2}\Big)

Thus, our function is:

f(t)=510e^{t\ln(.5)/38}

Then after one year or 365 days, the amount remaining will be about:

f(365)=510e^{365\ln(.5)/38}\approx 0.6548

5 0
2 years ago
Which set of numbers does -5 belong ​
tester [92]
Is there any more to this question? Because-5 doesn’t belong anywhere
3 0
3 years ago
I need help sooo bad!!
yarga [219]

Answer:

B?

Step-by-step explanation:

Well, 68% is greater than the 50% ratio of the jelly, and its also greater than C so, id have to say B.

Tell me if im wrong sorry if i am.

3 0
2 years ago
Read 2 more answers
The width of Maya’s poster is 2 inches shorter than the length. The graph models the possible area (y) of Maya’s poster determin
ArbitrLikvidat [17]
200 would be the correct answer
3 0
3 years ago
Other questions:
  • Keiko sold 3 less than three-fourths of his sister’s sales. Which expression represents what Keiko sold?
    14·1 answer
  • PLEASE HURRY WILL MARK ANSWER AS BRAINLIEST!!!
    15·1 answer
  • The expression 2m+ 10c gives the amount of money in dollars , a dessert store makes from selling m muffins and a c Cakes How muc
    13·1 answer
  • Which statement is true regarding Table G and Table H?
    13·1 answer
  • Which of the following is true with respect to the following functions
    9·1 answer
  • Elena goes for a long walk this graph shows her time and distance traveled throughout the walk what was her fastest speed in mil
    5·1 answer
  • Evaluate the function. y = 2x - 2; x = 18
    12·2 answers
  • Nth term of the sequence 8,48,288
    7·1 answer
  • 5(x-3)=3x+5 (solve for x)
    10·1 answer
  • PLEASE HELP QUESTION IN PIC.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!