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2 years ago

You earn 28$ for washing 7 cars. How much do you earn for washing 3 cars?

Mathematics

2 answers:

Fiesta28 [93]2 years ago

8 0

Answer:

$12

Step-by-step explanation:

;)

natima [27]2 years ago

7 0

Answer:

Step-by-step explanation:

28 divided by 7 = 4

4 x 3 = 12

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A math test is worth 100 points and has 38 problems. Each problem is worth either 5 points or 2 points. How many problems of eac

Nat2105 [25]

Answer:

5 points question is 8

and 2 points questions is 30 !!

Step-by-step explanation:

Let the number of 5 points questions be x and number of the 2 points questions be y !!

Given :- The paper has 38 problems

i.e,

number of 5 points Q + number of 2point Q = 38

=> x + y = 38

=> x = 38 - y .... ( i )

And , The test worth 100 pts :-

There must be x number of Questions which carry 5 points and there must y number of questions which carries 2 points ( as assume above )

so, 5x + 2y = 100 .... ( ii )

Putting value of the x in ( ii )

5 ( 38 - y ) + 2y = 100

190 - 5y + 2y = 100

- 3y = - 90

y = 30

Putting value of y in ( i )

x = 38 - y

x = 38 - 30

x = 8

So, the Number of 5points Question is

x = 8

and , the number of 2 points questions is y = 30 !!

4 0

2 years ago

What is 5.8×10^6 mg/s in grams per minute? A. 9.7×10^9 g/min B. 9.7 × 10^7 g/min C. 3.48 × 10^5 g/min D. 3.48 × 10^3 g/min.

Luda [366]

1 second = 5.8x10^6 mg
60 seconds = 5.8x10^6 x 60 = 3.48x10^8 mg
(i.e 3.48x10^8 mg/minute)

1000 mg = 1 g
3.48x10^8 mg = 3.48x10^8/1000 = 3.48x10^5 g

Therefore, 5.8x10^6 mg/s = 3.48x10^5 g/min

6 0

2 years ago

Read 2 more answers

Expand and simplify yeeeeeaaaaaaaaaaaaa

Paha777 [63]

(x+2y+z) (x-2y-z)
= x^2 - 2xy - xz + 2xy - 4y^2 - 2yz + xz - 2yz - z^2 = x^2 - 4y^2 - 4yz -z^2 Hope it helped!

5 0

2 years ago

Mike is redecorating his office’s conferences rooms. When they were last painted it took 20 pints of paint. The paint he is usin

german

Previously the volume of paint consumed was: 20 pints

New paint is available in unit of liters.

since, 1 pint = 0.47 liter

20 pint = 9.46 liters (10 liters approx.)

Mike will need to buy 10 liters of paint.

4 0

2 years ago

Five pipes can fill a tank in 80 minutes. At the same rate, how long will it take 8 pipes to fill the same tank?

miss Akunina [59]

Answer:

50 minutes

Step-by-step explanation:

it takes 80 minutes for 5 pipes

so for 1 pipe it will take 5x80=400min

and for 8 pipes it will take 400/8=50min

8 0

2 years ago

You earn 28$ for washing 7 cars. How much do you earn for washing 3 cars?​

You earn 28$ for washing 7 cars. How much do you earn for washing 3 cars?