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
IRISSAK [1]
3 years ago
8

Person 1 can do a certain job in 21 minutes, and person 2 can do the same job in 28 minuets. When completing the job together, w

hich expression would be used to represent the amount of work done by person 1. 21,1/21,x/21,21x
Mathematics
1 answer:
Hoochie [10]3 years ago
8 0

Answer:

1/21.

Step-by-step explanation:

To solve the problem 'How long would they take to do the job working together?'  you would work in fractions of the job done / minute:

1/21 + 1/28 = 1/x.

So for person 1 the expression is 1/21.

You might be interested in
A factory uses 15 pounds of steel for every 18 pounds of copper. How much copper will the factory use for 2,700 pounds of steel?
Nostrana [21]

Answer:

3240 pounds of copper would be used

Step-by-step explanation:

\frac{18}{15}=\frac{x}{2700} \\(2700)*(\frac{18}{15})=x\\3240lbs=x

3 0
2 years ago
Midpoint of 4 – 3i and –2 + 7i please help!!!!!
GenaCL600 [577]
Hello : 
 let  : z = 4-3ii       z' = -2+7i
 the distance between the points 4-3i and -2+7i is : <span>|z - z' |
</span> |z - z' | = |4-3i+2-7i| = |6-10i | =√(6²+(-10)²) =√136
4 0
3 years ago
Simplify (4xy-2x)+(2x^2+8x)
devlian [24]

Answer: 4xy+6x+2x^2

Step-by-step explanation:

4xy-2x+2x^2+8x

we can combine the terms that only have an x (Ax for any number A)

in this case that's -2x and 8x

-2x+8x=6x

the other things can't be combined

thus you end up with

4xy+6x+2x^2

8 0
2 years ago
Find f(4) if f(x) = 3x + 1
Alenkasestr [34]

Answer:f(4)=−3x−1 f ( 4 ) = - 3 x - 1.

Step-by-step explanation:ff(4)=−3x−1 f ( 4 ) = - 3 x - 1.

f(4)=−3x−1 f ( 4 ) = - 3 x - 1. Replace the variable x x with 4 4 in the expression. f(4)=−3⋅4−1 f ( 4 ) = - 3 ⋅ 4 - 1. Simplify the result.

4 0
3 years ago
Find the volume of the regular pyramid given that 12 cm is the height of the pyramid.
PolarNik [594]

Answer:

256.4

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • The sum of Rodney and his sister is 31 his sister is five years less than three times Rodney’s age what is the difference in age
    13·1 answer
  • The equation 3 X -6x=72 Has a solution between 4 and 5
    11·1 answer
  • Do you think a mix number is a rational number explain
    11·1 answer
  • Suppose you need to know an equation of the tangent plane to a surface S at the point P(4, 1, 3). You don't have an equation for
    15·1 answer
  • 4% as a fraction in simplistic form
    13·1 answer
  • Quinn makes 6 free throws, and Sam makes 3 free throws. what is the ratio?
    13·2 answers
  • Please help I'm confused
    14·1 answer
  • You sell necklaces and rings at a craft fair.You collect $312 selling a total of 28 pieces of jewelry. How many of each type of
    12·1 answer
  • What is the greatest common factor (GCF) of 16 and 24?<br> GCF =
    8·2 answers
  • Can someone please help me with math
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!