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Daniel [21]
3 years ago
6

Write an explicit formula an, the nth term of the sequence 23,25,27

Mathematics
1 answer:
AnnyKZ [126]3 years ago
7 0

Answer:

2n+21

Step-by-step explanation:

rule = 2 so 2n

if n=1, 1x2=2     23-2=21

so +21

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Simplify 6 + 7.2y - 4.2y + 1
jok3333 [9.3K]

Answer:

3y+7

Step-by-step explanation:

6+7.2y+−4.2y+1

(7.2y+−4.2y)+(6+1)

3y+7

5 0
3 years ago
If John has $400 in his savings account. If he spends $50. how much will his account decrease?
olga55 [171]

Answer:

Step-by-step explanation:

it will decrease by 50 dollar which makes it 350

4 0
3 years ago
Select two ratios that are equivalent to 7: 10
hammer [34]
21:30 and 35: and 50 this is because 7 times 3 is 21, 10 times 3 is 30, and 7 times 5 is 35, and lastly 10 times 5 is 50
4 0
3 years ago
Read 2 more answers
Simplify by combining like terms: 9x - 3y -5x + 2y -x + 2
UNO [17]

Answer:

3x-y=-2

Step-by-step explanation:

9x-5x-x-3y+2y=-2

3x-y=-2

7 0
3 years ago
The question is below​
Cloud [144]

Answer:

See below.

Step-by-step explanation:

a.

The first figure has 1 square. The second figure has a column of 2 squares added to the left. The third figure has a column of 3 squares added to the left. Each new figure has a column of squares added to the left containing the same number of squares as the number of the figure.

b.

Figure 10 has 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 squares.

c.

The formula for adding n positive integers starting at 1 is:

1 + 2 + 3 + ... + n = n(n + 1)/2

For figure 55, n = 55.

n(n + 1)/2 = 55(56)/2 = 1540

d.

Let's use the formula set equal to 190 and solve for n. If n is an integer, then we can.

n(n + 1)/2 = 190

n(n + 1) = 380

We know that 380 = 19 * 20, so n = 19.

Answer: yes

e.

Use the formula above,

S = n(n + 1)/2, where S is the sum.

f.

n(n + 1) = 1478

38 * 39 = 1482

37 * 38 = 1406

3 0
3 years ago
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