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
jasenka [17]
3 years ago
6

A student says that if 5x2 = 20, then x must be

Mathematics
1 answer:
lutik1710 [3]3 years ago
4 0

Answer:

I agree with the student's answer. "x" cannot be -2 because then it would make -20 which is not equal to 20:

5(-2)(2) = ?

-10 x 2 = ?

? = -20

-20 ≠ 20

Step-by-step explanation:

Justificaiton:

5(x)(2) = 20

10(x) = 20

10/10(x) = 20/10

x = 2

Second Justification:

5(x)(2) = 20

5/5(x)(2) = 20/5

2x = 4

2x/2 = 4/2

x = 2

You might be interested in
Need help with this question thanks :)
Fantom [35]

Answer:

Omar could invite 19 friends.

Step-by-step explanation:

the equation for this word problem would be

5x+30=125

subract 30 from both sides

5x=95

divide both sides by 5

x=19

8 0
3 years ago
Read 2 more answers
4x+1 ,3x find the value of x
In-s [12.5K]
I'm assuming that you meant 4x+1=3x?

Subtracting 4x, we get 1=-x.  Multiplying by -1, we get x=-1 as the solution.
6 0
3 years ago
Read 2 more answers
3 ten thousand + 14 tens + 16 ones
zzz [600]
30,1416 I'm pretty sure this is the answer
8 0
3 years ago
Read 2 more answers
Terri is rewriting 7 to the 13th power in expanded form. How many factors should she use in her expression?
Pachacha [2.7K]
13


Because the exponent is really just how many factors you have.
For example 2 to the power 5 would have 5 factors in expanded form.
7 0
3 years ago
Read 2 more answers
Calculate 3n-1 for n equals 2 to 10 explain how you know that the numbers are composite
Troyanec [42]

composite number means a number that can be formed by multiplying two smaller numbers

3n-1 for n=2, 3n-1=3*2-1=6-1=5

3n-1 for n=10, 3n-1=3*10-1=30-1=29

5 is composite because 2*2.5=5

29 is composite because 5*5.8=29

5 0
3 years ago
Other questions:
  • Given that BCA = 15° and mangle DCE = 38°, find ACE.
    5·1 answer
  • PLEASE HELP WITH ALGEBRA QUESTIONS!!
    6·1 answer
  • Caleb earned $49 for working 7 hours. How much would he earn for working 14 hours at the same rate
    5·2 answers
  • 5 miles=8km how many miles in 80km
    11·1 answer
  • The cost of a raffle ticket is $2. There is also a one-time $5 fee to be part of the raffle. Which of the following expressions
    11·2 answers
  • Samantha is making soup. to make the broth, she combines 2/5 cup of vegetable stock and 2/3 cup of chicken soup stock. Boiling
    8·2 answers
  • Are these two lines, parallel, perpendicular, or neither? Explain why.
    12·2 answers
  • Which diagram best shows how fraction bars can be used to evaluate One-half divided by one-fourth? A fraction bar labeled 1. Und
    5·1 answer
  • 8 7/3 divided 7 1/2<br><br> 6 1/2 divided 34/4 <br><br> 23/3 divided 6 2/5<br><br> Pls help ASAP
    13·1 answer
  • After 8 years, what is the total amount of a compound interest investment of $25,000 at 3% interest, compounded quarterly?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!