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Eva8 [605]
3 years ago
11

Help me please I’ll mark as brainliest!!

Mathematics
1 answer:
Vladimir79 [104]3 years ago
7 0

Answer:

i wish i could help so sorry

Step-by-step explanation:

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List of all numbers less than 30 are divisible by 8?
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8
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8 0
2 years ago
Read 2 more answers
A radioactive substance decreases in the amount of grams by one-third each year. If the starting amount of the
katovenus [111]

Answer:

The sequence is geometric. The recursive formula is a_{n}=2/3a_{n-1}

Step-by-step explanation:

In order to solve this problem, you have to calculate the amount of the substance left after the end of each year to obtain a sequence and then you have to determine if the sequence is arithmetic or geometric.

The substance decreases by one-third each year, therefore:

After 1 year:

1452-\frac{1}{3}(1452)

Using 1452 as a common factor and solving the fraction:

1452(1-\frac{1}{3})=1452(\frac{2}{3})=968

You can notice that in general, after each year the amount of grams is the initial amount of the year multiplied by 2/3

After 2 years:

968(\frac{2}{3})=\frac{1936}{3}

After 3 years:

\frac{1936}{3}(\frac{2}{3})=\frac{3872}{9}

The sequence is:

1452,968,1936/3,3872/9....

In order to determine if the sequence is geometric, you have to calculate the ratio of two consecutive terms and see if the ratio is the same for all two consecutive terms. The ratio is obtained by dividing a term by the previous term.

The sequence is arithmetic if the difference of two consecutive terms is the same for all two consecutive terms.

-Calculating the ratio:

For the first and second terms:

968/1452=2/3

For the second and third terms:

1936/3 ÷ 968 = 2/3

In conclussion, the sequence is geometric because the ratio is common.

The recursive formula of a geometric sequence is given by:

a_{n}=ra_{n-1}

where an is the nth term, r is the common ratio and an-1 is the previous term.

In this case, r=2/3

7 0
3 years ago
I only need number 1 i don’t understand.
valentinak56 [21]

Answer:

12

Step-by-step explanation:

in this problem there is A+b=15

A=9

B=12

5 0
3 years ago
To make a certain color of paint, the ratio of green paint to white paint is 5:2. How many gallons of green paint are required t
Cerrena [4.2K]

Answer:

70:28

Step-by-step explanation:

70:28 because you just multiply 14 by both numbers and get your answer.

7 0
3 years ago
Find the value of x.<br> SO<br> 3x + 7<br> 3xt7H60t60=180<br> 3x+ 147=180<br> - 147<br> (
ASHA 777 [7]
I’m not sure if I remember well but I think it’s the answer!

6 0
3 years ago
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