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trasher [3.6K]
3 years ago
8

The half-life of a radioactive kind of europium is 9 years. How much will be left after 18 years, if you start with 40 grams of

it ?
Mathematics
1 answer:
Viktor [21]3 years ago
6 0

Answer:There will be 10 grams left because you subtract half of the current amount from it every 9 years.

Step-by-step explanation:

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Need help<br><br> 3y+5x=22; x=y/2
Marizza181 [45]

Answer-

point from:

(2,4)

explanation from:

x =2, y = 4

4 0
3 years ago
Read 2 more answers
Which set of points is a function?
mario62 [17]

Answer:

B

Step-by-step explanation:

This is a really simple topic. All you need to do when seeing these ordered pairs is see which has x-values that don't repeat. Over here, we can see that that is B, so B is the correct option.

5 0
2 years ago
I REALLY NEED HELP PLEASE A twelve-pack of Orange Crush is priced at $3.00. A six-pack is priced at $1.75. Which is the better v
insens350 [35]

Answer:

A. The twelve-pack is better because each soda cost $0.25

Step-by-step explanation:

12 x 0.25 = $3.00 which is only like a buck and 25 cents more for 6 more orange juices.

In the market, you would buy the 12 pack because $1.25 is less than 6 more orange crushes. Also, it's a solid deal and the rate is not pricey! :)

7 0
2 years ago
- 6x +15 <br>Can anyone please show me the steps of solving this equation​
Vesna [10]

Answer:

-6x + 15 = - 69 which x = 14

Step-by-step explanation:

You cannot solve this equation. There is no equal sign anywhere. Either you mean

-6x = 15 in which case the answer is

-6x/-6 = 15/-6

x = - 2 1/2 or x= - 2.5

or you mean that you use the distributive property

- 3(2x + 5)

You may have left something out of this.

-6x + 15 = -  69

You can do it now that you have the complete equation. But you need the entire equation before you can answer the question.

Subtract - 15 from both sides.

-6x + 15 - 15 = -69 - 15

-6x = - 84

Divide by - 6

-6x/-6 = - 84/-6

x = 14

But what you want is

-6x + 15

-6*14 + 15

-84 + 15

-69

-6x + 15 = - 69

when x = 14 which is usually what you are asked.

5 0
2 years ago
The rectangle shown has a perimeter of 156 cm and the given area. Its length is 6 more than five times its width.
Stells [14]
P=156 cm
l=6+5w
P=2(l+w)
156=2(6+5w+w)
156=2(6+6w)
156=12+12w
12+12w=156
12w=156-12
12w=144
w=12cm

l=6+5•12
l=6+60
l=66cm
8 0
2 years ago
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