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3 years ago

9

jin has a granddaughter named Wei. jin's age is 2 more than 7 Times Wei’s age, in years. Jin’s age is 86 years old. Write and so

lve an equation to find w, Wei’s age in years.

1 answer:

Nonamiya [84]3 years ago

4 0

14 years old because You have to MoBu +7×2

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For each of the finite geometric series given below, indicate the number of terms in the sum and find the sum. For the value of

kotykmax [81]

Answer:

Number of term N = 9

Value of Sum = 0.186

Step-by-step explanation:

From the given information:

Number of term N = $3 (0.5)^{5} + 3 (0.5)^{6} + 3 (0.5)^{7} + \cdots + 3 (0.5)^{13}$

Number of term N = $3 (0.5)^{5} + 3 (0.5)^{6} + 3 (0.5)^{7} +3 (0.5)^{8}+3 (0.5)^{9} +3 (0.5)^{10} +3 (0.5)^{11}+3 (0.5)^{12}+ 3 (0.5)^{13}$

Number of term N = 9

The Value of the sum can be determined by using the expression for geometric series:

$\sum \limits ^n_{k=m}ar^k =\dfrac{a(r^m-r^{n+1})}{1-r}$

here;

m = 5

n = 9

r = 0.5

Then:

$\sum \limits ^n_{k=m}ar^k =\dfrac{3(0.5^5-0.5^{9+1})}{1-0.5}$

$\sum \limits ^n_{k=m}ar^k =\dfrac{3(0.03125-0.5^{10})}{0.5}$

$\sum \limits ^n_{k=m}ar^k =\dfrac{(0.09375-9.765625*10^{-4})}{0.5}$

$\sum \limits ^n_{k=m}ar^k =0.186$

6 0

3 years ago

Melly was n years old last year. How old will she be in 4 years time?

deff fn [24]

Answer:

n + 5

Step-by-step explanation:

if last year melly was N year old, she is now n+1 years old.

So, in four years, she will be

(n + 1) + 4 years old

meaning that she will be n + 5 years old.

hope this helps!! :)

6 0

2 years ago

Read 2 more answers

Certain cooking oil has a density of 0.91 grams per milliliter. Which of the following series of calculations correctly determin

pishuonlain [190]

Answer:

Step-by-step explanation:

Here is a picture of the answer, since I couldn't put into words!

3 0

3 years ago

Please please answer and dont put any links :)

maxonik [38]

9x-6+6x-1=98
15x+7=98
15x=105
x=7
hope this helps :)

3 0

3 years ago

Is fraction a linear equation

olya-2409 [2.1K]

Answer:

NO

Step-by-step explanation:

We need more than two operations to solve a linear equation . If an equation contains fractions, multiply both sides of the equation by the least common denominator (LCD) to clear fractions.

6 0

3 years ago