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baherus [9]
3 years ago
14

One student can paint a wall in 20 minutes. Another student can paint the same wall in 30 minutes. Working together, how long wi

ll it take for them to paint the wall?
10 minutes

12 minutes

15 minutes

25 minutes
Mathematics
1 answer:
Katarina [22]3 years ago
5 0

1) in one minute for first  wiil be 1/20

the other 1/30, it means that  A paint in one minute  1/20 and B 1/30 then   A+B in one minute 1/20 + 1/30 = 3+2/60 = 5 / 60,  5/60 = 1/12

if in one min they make 1/12 then  in 12  min they  paint all the wall

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In a right triangle, 40-x=(3x). What is the value of x?
Archy [21]

Answer:

x=10

Step-by-step explanation:

Let's solve your equation step-by-step.

40−x=3x

Step 1: Simplify both sides of the equation.

40−x=3x

40+−x=3x

−x+40=3x

Step 2: Subtract 3x from both sides.

−x+40−3x=3x−3x

−4x+40=0

Step 3: Subtract 40 from both sides.

−4x+40−40=0−40

−4x=−40

Step 4: Divide both sides by -4.

−4x

−4

=

−40

−4

x=10

8 0
3 years ago
The speed of radio waves can be approximated to be 299,790,000 meters per second. The wavelength of a particular radio station’s
azamat

Answer:

f = \frac{299790000 \frac{m}{s}}{3.03 m}= 9890594.06 Hz

And if we convert to megahertz we got:

9890594.06 Hz *\frac{1MHz}{10^6 Hz}= 98.9 MHz

Step-by-step explanation:

For any mechanical wave we have the following general relationship:

v = \lambda f

where:

v represent the speed of the wave = 299790000 m/s

\lambda = 3.03m represent the wavelength for the radio station

f represent the frequency of interest

If we solve for the frequency we got:

f = \frac{v}{\lambda}

And replacing the values we got:

f = \frac{299790000 \frac{m}{s}}{3.03 m}= 9890594.06 Hz

And if we convert to megahertz we got:

9890594.06 Hz *\frac{1MHz}{10^6 Hz}= 98.9 MHz

6 0
3 years ago
What is the other term for integers
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5 0
3 years ago
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There are many numbers that divide 109 with a remainder of 4. List all two-digit numbers that have that property.
Paladinen [302]

Answer:

3 Numbers: 15, 21, 35

Step-by-step explanation:

We want number that divide 109 with a remainder of 4.

Thus, it can divide of 109 - 4 = 105

Factors of 105 = 3, 5, 7

Thus for getting two digit number it must be Multiple of any two factors of 105.

i.e. 15, 21 and 35

Hence there are only 3 numbers that divide 109 with a remainder of 4.

7 0
3 years ago
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