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
Paladinen [302]
4 years ago
10

Solve for x. x + 3x + 5 =21

Mathematics
2 answers:
timurjin [86]4 years ago
4 0

Answer:

x=4

Step-by-step explanation:

In order to solve for x, we must isolate x on one side of the equation.

x+3x+5=21

First, combine like terms. x and 3x are both terms with variables, and can be combined.

(x+3x) + 5=21

4x + 5=21

5 is being added to 4x. The inverse of addition is subtraction. Subtract 5 from both sides of the equation.

4x+5-5= 21-5

4x= 16

x is being multiplied by 4. The inverse of multiplication is division. Divide both sides by 4.

4x/4=16/4

x= 16/4

x=4

Let's check our solution. Plug 4 in for x and solve.

x+3x+5=21

4+3(4)+5=21

4+12+5=21

16+5=21

21=21

This solution checks out, so we know our answer is correct.

x is equal to 4, x=4.

lutik1710 [3]4 years ago
3 0

Answer:

x = 4

Step-by-step explanation:

x + 3x + 5 = 21

4x + 5 = 21

4x = 21 - 5

4x = 16

x = 16/4

x = 4

verify:

4 + 3*4 + 5 = 21

4 + 12 + 5 = 21

You might be interested in
What is the total amount that Matthew's bank will receive after lending him $8,000 for four years at an interest rate of 6 perce
bija089 [108]

Answer:

Total amount that Matthew's bank will receive is $10099.81.

Step-by-step explanation:

We need to find the amount Matthew's bank will receive after lending him $8,000 for four years at an interest rate of 6 percent, compounded annually.

The formula for compound interest is:

A=P(1+r)^n

Where A = future value

P= Principal Amount

r = interest rate

and n= time

So in the question we are given:

P= $8000

r = 6% or 0.06

t = 4 (since 4 yeras compounded annually)

A= 8000*(1+0.06)^4

A= 8000*(1.06)^4

A= 10099.81

So, total amount that Matthew's bank will receive is $10099.81.

6 0
3 years ago
SOMEONE KNOW THIS, IS STUDY ISLAND
Tems11 [23]

Answer:

the option are A.

92.4%

B.

7.6%

C.

91.8%

D.

8.2%

Step-by-step explanation:

Think of it what times 61 will equal 66....

     61 () = 66

     (?%) = 66 /61

     (?) = 1.08196   

so now it gets tricky get the percentage increase correct

based on the given answer choices I'ld say it is D

     % increase = (1.08196 - 1) (100)          Why the subtraction of one? ?

                        = 8.196%

                        = 8.2 %

   

7 0
3 years ago
(2.2.5) In horse racing, one can make a trifecta bet by specifying which horse will come in first, which will come in second, an
DaniilM [7]

Answer:

56 ways.

Step-by-step explanation:

This question is solved by using combinations and permutations chapters in the math book.

To put it simply, we need to find the number of 3 horse combinations we can make from 8 horses. This requires the combinations formula:

C(n,r)=\frac{n!}{r!(n-r)!}

here n is the total number of objects to choose from, and r is the number of objects we require in the combination or group.

Since there are 8 horses, n= 8

Since we need to choose only 3 of them, and order does not matter, r= 3

Solving the equation above using these inputs gives us 56 unique ways we can choose the three winners.

7 0
3 years ago
0.22y × 0.06 =<br>please help me​
irakobra [83]

Answer:

0.0132y :DDDDDDDDDD

7 0
2 years ago
A stockbroker knows from experience that the probability that a client owns stocks is 0.60. P(A) The probability that a client o
Irina18 [472]

Answer:

the probability of a client owning stocks OR bonds is 0.825

Step-by-step explanation:

The computation of the probability of a client owning stocks OR bonds is given below:

= P(stocks) + P(bonds) - P(stocks and bonds)

= 0.60 + 0.50 - (0.55 × 0.50)

= 0.60 + 0.50 - 0.275

= 0.825

Hence, the probability of a client owning stocks OR bonds is 0.825

6 0
3 years ago
Other questions:
  • Which of the following graphs represent a function? 4072-01-02-01- a. Graph A and Graph C b. Graph A c. Graph D d. Graph B and G
    5·1 answer
  • Can you solve this?<br> 1+cot^2θ=csc^2θ
    10·1 answer
  • My denomination is 6 more than my numerator my simplest form is 2/5 what fraction am i
    9·1 answer
  • A cable car can safely carry n people thete are alreafy 3/4n people on the cable car only 12 more people can board the cable car
    13·1 answer
  • Find the length of a rectangular prism having a volume of 2830.5 cubic meters width of 18.5 meters and height of 9 meters
    9·1 answer
  • Jules tosses a penny 3 times. List all the possible combinations of heads (H) and tails (T) that Jules might get.
    8·2 answers
  • Use synthetic division to find the quotient and remainder when 23? +622 - 142 +9 is divided by 2 +3.
    8·1 answer
  • How many miles did a plane travel if it flew <br> 455 mph in three hours
    6·1 answer
  • Solve the equation -4(1.75 + x) = 18
    14·1 answer
  • Name each indicated part of the algebraic expression.<br><br> 4x + y<br> 3<br> - 2.2
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!