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3 years ago

Please help me help this is my last question please please please if you help me I’ll help you

Mathematics

2 answers:

Pavlova-9 [17]3 years ago

4 0

Answer:12

Step-by-step explanation: 3 x (2x2)= 3x4= 12

OLga [1]3 years ago

4 0

The answer is 12, 2x2=4 so you would do 3x4=12

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Y and x have a proportional relationship, and y = 12 when x = 5. What is the value of y when x = 8?

serious [3.7K]

When x = 8 y = 15

The way to figure this out is to subtract 12 by 5. That’s 7 so there’s a difference of 7 between both of the numbers.

Hope this helped!

8 0

3 years ago

Inverse Function -5 + 5/2x

Lapatulllka [165]

Answer:

y = (2/5)x + 2

Step-by-step explanation:

To find the inverse of a function, we simply exchange the variables x and y and solve for y.

For this function we will write it as such:

y = -5 + (5/2)x

So to find the inverse, we will swap the x and y and solve.

y = -5 + (5/2)x

x = -5 + (5/2)y

x + 5 = (5/2)y

(2/5) * (x + 5) = y

(2/5)x + (2/5)5 = y

(2/5)x + 2 = y

Thus the inverse of the function is:

y = (2/5)x + 2

Cheers.

3 0

3 years ago

Vera spends all of her free time surfing. Today she was out on the waves for 2 hours. That is 60% less time than yesterday. How

morpeh [17]

Answer: Vera spent 1.2 hours surfing yesterday.

<h3>Step-by-step explanation:</h3><h2>60% of 2 is 1.2 </h2>

5 0

3 years ago

The population of rabbits on an island is growing exponentially. In the year 2000, the

jonny [76]

Answer:

Step-by-step explanation:

630

8 0

3 years ago

Read 2 more answers

Show work and explain with formulas.

Natasha_Volkova [10]

23 Answer: $\bold{\dfrac{29,524}{9}}$

<u>Step-by-step explanation:</u>

$\dfrac{1}{9}+\dfrac{1}{3}+1+...+2187\\\\\\a_1=\dfrac{1}{9}=3^{-2}\qquad r=3\qquad a_n=2187\\\\\underline{\text{Find n:}}\\a_n=a_1\cdot r^{n-1}\\2187=3^{-2}(3)^{n-1}\\2187=3^{n-3}\\3^7=3^{n-3}\\7=n-3\\10=n$

$\underline{\text{Find the sum:}}\\S_n=\dfrac{a_1(1-r^n)}{1-r}\\\\\\S_{10}=\dfrac{\frac{1}{9}(1-3^{10})}{1-3}\\\\\\.\quad =\dfrac{1-59,049}{(9)(-2)}\\\\\\.\quad =\dfrac{-59,048}{9(-2)}\\\\\\.\quad =\large\boxed{\dfrac{29,524}{9}}$

24 Answer: $\bold{\dfrac{364}{9}}$

<u>Step-by-step explanation:</u>

$a_1=27\qquad r=\dfrac{1}{3}\qquad n=6\\\\S_n=\dfrac{a_1(1-r^n)}{1-r}\\\\\\S_6=\dfrac{27(1-\frac{1}{3}^6)}{1-\frac{1}{3}}\\\\\\.\quad =\dfrac{27(\frac{728}{729})}{\frac{2}{3}}\\\\\\.\quad =\dfrac{27(728)}{729}\cdot \dfrac{3}{2}\\\\\\.\quad =\large\boxed{\dfrac{364}{9}}$

25 Answer: n=7

<u>Step-by-step explanation:</u>

$\{-6,\ -12,\ -24,\ ...\ \}\\\\a_1=-6\qquad r=2\qquad S_n=-762\\\\S_n=\dfrac{a_1(1-r^n)}{1-r}\\\\\\-762=\dfrac{-6(1-2^n)}{1-2}\\\\\\-762=\dfrac{-6(1-2^n)}{-1}\\\\\\\dfrac{-762}{6}=1-2^n\\\\-127=1-2^n\\\\-128=-2^n\\\\128=2^n\\\\2^7=2^n\\\\\large\boxed{7=n}$

3 0

3 years ago

Read 2 more answers