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
alex41 [277]
2 years ago
14

Marcus finds that (3x^2-2y^2+5x)+(4x^2+12y^2-7x)=7x^2-10y-2x. What error did Marcus make?

Mathematics
2 answers:
ale4655 [162]2 years ago
7 0

Answer:

He combined the terms –2y2 and 12y2 incorrectly.

boyakko [2]2 years ago
4 0

Answer:

7x^2+10y^2-2x is the correct answer, Marcus put -10y INSTEAD of +10y^2

Step-by-step explanation:

(3x^2-2y^2+5x)+(4x^2+12y^2-7x)

Combine like terms- I'll add x^2 first, then y^2, and then finally x, and it will be in that order.

7x^2+10y^2-2x

Make sure to check your signs are correct, and you wrote down the proper exponents.




You might be interested in
12. 4(2x - 8) = 3(2 – 3x)<br> Need help to solve it in steps
Reil [10]
8x - 32 = 6 - 9x
17x = 38
x = 38/17
4 0
3 years ago
Math help owo pls will reword #_# pleath
timama [110]

Question 13: The answer is D

Question 7: The answer is C

Question 14: The answer is B

And the question for the last Pic, the correct graph is B.

8 0
3 years ago
Read 2 more answers
Earth has been charted with vertical and horizontal lines so that points can be named with coordinates. The horizontal lines are
inna [77]
<span>a. The radius of earth is about 6400 kilometers. Find the circumference of a great circle.

Circumference = 2π(radius) = 2π(6400 km) = 40.212,39 km

b. Write an equation for the circumference of any latitude circle with angle theta

As stated, </span><span><span>the length of any parallel of latitude (this is the circumference of corresponding circle) is equal to the circumference of a great circle of Earth times the cosine of the latitude angle</span>:

=> Circumference = 2π*radius* cos(Θ) = 2 π*6400km*cos(Θ) = 40,212.39 cos(Θ)

Answer: circumference = 40,212.39 cos(Θ) km

c. Which latitude circle has a circumference of about 3593 kilometers?

Make </span><span><span>40,212.39 cos(Θ)</span> km = 3593 km

=> cos(Θ) = 3593 / 40,212.39 = 0.08935 => Θ = arccos(0.08935) = 84.5° = 1.48 rad

Answer: 1.48

d. What is the circumference of the Equator? </span>

For the Equator Θ = 0°

=> circumference = 40,213.49cos(0°) km = 40,212.49 km

Answer: 40,212.49 km

7 0
3 years ago
mr abu bought a microwave oven,a digital camera and a television set for $3130. The microwave oven cost $100 less than the digit
AveGali [126]
Sorry if it is messy but if you dont understand feel free to ask .

4 0
3 years ago
Which explicit formula can be used to find the accounts balance at the beginning of year 3?
balandron [24]

The formula for the amount A in an account with principal P and interest rate r compounded annually for t years is

... A(t) = P(1+r)^t

You want to find A when P=400, r=0.05, and t=3. Substituting those values gives you

... A(3) = 400·(1 +0.05)³

The appropriate choice is

... A. A(3) = 400·(1 +0.05)³

7 0
3 years ago
Other questions:
  • What is y+3=7(x−2) written in standard form
    14·2 answers
  • (2x -2)^-3<br>can anyone help me with this?​
    7·1 answer
  • What is the cube of the square of the second smallest prime number?
    7·1 answer
  • 478 cm x 427 cm = ? meters
    15·1 answer
  • 3 (x - 3) + x (r + 4)
    5·1 answer
  • Find the median of 11, 99, 62, 30, 41
    9·1 answer
  • What is the simplified value of the exponential expression 64 1/3?
    13·1 answer
  • Write the times of four trains as 12 hr. clock<br> a. 14:32<br> b. 16:30<br> c. 06:45<br> d. 10:29
    7·1 answer
  • Determine if an exponential would be an appropriate model for the data shown in each scatter plot. Select
    8·2 answers
  • Given that<br> a = 1, b = 3 and c = 2<br> work out<br> b² - 2ac
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!