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
Gianna put $1000 in a savings account for 18 months, The interest on the account is 3.5%. How much will Gianna earn in interest?
zimovet [89]

Answer:

amount of interest = 52.5

amount at the end of the period = 1052.5

Step-by-step explanation:

use the formula for simple interest

PRT/100

P is the principle

R is the rate of interest charged

T is the Time taken

18 months  = 1 years 6 months ( 1.5 years)

1000 * 3.5 * 1.5 = 5250

5250/100 = 52.5

the amount of interest = <u>52.5</u>

the amount she will have at the end of the period

= 1000 +52.5

= <u>1052.5</u>

8 0
2 years ago
Is $1.45 a natural number ,integer, irrational number, or a real number
Rainbow [258]

Answer:

Real Number  

Step-by-step explanation:

These are numbers which include both rational AND irrational!!!

Doesn't go on forever.

Brainliest??

4 0
2 years ago
Read 2 more answers
6. Sketch the region enclosed by the graphs of x =0, 6y-5x=0 and x+3y=21. Find the area
kow [346]
We can see that revolving the region formed by intersecting 3 lines, we will get 2 cones that are connected their bases.
Volume of the cone V=1/3 *πr²*h

1) small cone has r=5, and h=5
Volume small cone V1= 1/3 *π*5²*5 = 5³/3 *π
2) large cone has r=5, and h=21-6=15, h=15
Volume large cone V2= 1/3 *π*5²*15 = 5³*π
3) whole volume
5³/3 *π + 5³*π=5³π(1/3+1)=((5³*4)/3)π=(500/3)π≈166.7π≈523.6

Area
we see 2 right triangles,
Area of the triangle=1/2*b*h, where b -base, h -height
1) small one, b=5, h=5
A1=(1/2)*5*5=25/2
2)large one, b=5, h=15
A2=(1/2)*5*15=75/2
3) whole area=A1+A2=25/2+75/2=100/2=50

3 0
3 years ago
Read 2 more answers
Some help with this
Anna71 [15]

Answer:

Growth

Step-by-step explanation:

7 0
3 years ago
In a 33' by 69.7' room, what is the diagonal length from corner to corner along the floor?
KonstantinChe [14]

Answer:

77.12 feets

Step-by-step explanation:

In a 33' by 69.7' room, what is the diagonal length from corner to corner along the floor?

Step one:

given data

Length of the room= 33 feets

width of the room = 69.7 feets

Required

The diagonal of the room

Step two:

from Pythagoras theorem

z^2= x^2+y^2

substitute

z^2= 33^2+ 69.7^2

z^2=1089+4858.09

z^2=5947.09

z=√5947.09

z=77.12 feets

8 0
3 years ago
Other questions:
  • You have two cards with a sum of -12 in both hands.
    12·1 answer
  • 8x + 4 = 44<br>What is x?<br><br>Test
    8·2 answers
  • Suppose y varies directly with x, and y = 45 when x = - 15. What is the value of y when x = − 6 ?
    15·1 answer
  • PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!
    15·1 answer
  • (-2-4i) + (1+6i) how do you do this question
    7·1 answer
  • Given a diameter of 24ft what is the exact area of the circle?
    12·1 answer
  • PLEASE ANSWER QUICK!!
    10·1 answer
  • First consider the system of equations y= -1/2x + 1 and y = x - 5. Then consider the system of inequalities y &gt; -1/2x + 1 and
    12·2 answers
  • I NEED HELP ASAP!please
    6·1 answer
  • 9+15÷5×13 using pemdas
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!