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3 years ago

The sum of two numbers is 30. the difference of the two number is 4. what number is lesser

Mathematics

1 answer:

4vir4ik [10]3 years ago

5 0

The lesser number is 13.

Step-by-step explanation:

Step 1 :

Let x represent the first number and y represent the second number

Given, sum of 2 numbers = 30

So we have,y + x = 30

The difference of the 2 numbers = 4

so x - y = 4

Step 2 :

Adding the 2 equations obtained in step 2 we have,

2 x = 34 => x = 17

x + y = 30 => y = 30-x= 30 - 17 = 13

Step 3 :

Answer :

So 17 and 13 are the 2 numbers.

The lesser number is 13.

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The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain after 1000 years?

adell [148]

Answer: 129.33 g

Step-by-step explanation:

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$If $A=200 \mathrm{mg}$ and $t=1000$ then,$$\begin{aligned}P &=200 e^{\left(\frac{\ln \left(1/2\right)}{1590}\right) \cdot 1000} \text \\\\&=129.33 \text { grams}\end{aligned}$

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2 years ago

Alr help me on this one.

tatyana61 [14]

Answer:

-1

Step-by-step explanation:

3 0

3 years ago

A plane can fly 7 miles per minute. The plane will fly 8 trips, and each trip is 810 miles. How many hours will the plane fly? S

ELEN [110]

7*60 = 420

810/420 = 1.9285

93- 100 = 53-60

subtract 40 from 93.

1.53*8 = 12.24

Answer: 12 hours and 24 Minutes

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4 0

3 years ago

Jake can mulch a garden in 30 minutes. together, jake and ross can mulch the same garden in 16 minutes. how much time t, in minu

Gelneren [198K]

"Jake can mulch a garden in 30 minutes." So, for 1 min Jake can mulch 1/30 part of a garden.

Ross can mulch the park for x minutes. So, for 1 min Jake can mulch 1/x part of a garden.

If they work together, for 1 min they will mulch (1/30 + 1/x) part of the garden.

At the same time, we know, that of they work together they can mulch the garden in 16 min, so for 1 min they will mulch 1/16 part of the garden.

Now, we can write an equation

$\frac{1}{30} + \frac{1}{x} = \frac{1}{16} \\ \\ \frac{1}{x} = \frac{1}{16} - \frac{1}{30} \\ \\ \frac{1}{x} =\frac{30-16}{16*30} \\ \\ \frac{1}{x} =\frac{14}{16*30} \\ \\x=\frac{16*30}{14}$

x≈34.3 (min)

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3 years ago

What two numbers can you add to get 24 and multiply to get 45

brilliants [131]

Is it 22.5 b/c 22.5 *2 = 45 and 22.5 +22.5= 45. or do u mean both numbers have to be the same

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3 years ago