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3 years ago

“y=3x-4 and -2y=-6x+a” can someone help me figure out the math to solve for A?

Mathematics

1 answer:

avanturin [10]3 years ago

8 0

Answer:

a=-4 ??

Step-by-step explanation:

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Compare the doubling times found with the approximate and exact doubling time formulas. Then use the exact doubling time formula

g100num [7]

The population after 15 years become according to the doubling time is 470000000.

According to the statement

We have given that the nation of 200 million people is growing at a rate of 9% per year.And we have to find that the What will its population be in 15 years.

So, For this purpose, we know that the

The doubling time is the time it takes for a population to double in size/value. It is applied to population growth etc.

So,

Population of nation is 200 million and growing at a rate of 9% per year.

So, 9% of the population is

Percentage population = 9/100*200,000,000

Percentage population = 9* 200,000,0

Percentage population = 1800,000,0.

It means 18000000 number of population is increased per year.

So, The total population increased in 15 years is 15*18000000

The total population increased in 15 years is 270000000.

The population after 15 years is 270000000 + 200,000,000

The population after 15 years is 470000000.

So, The population after 15 years become according to the doubling time is 470000000.

Learn more about doubling time here

brainly.com/question/16407547

#SPJ4

6 0

1 year ago

A glass paperweight has a composite shape: a square pyramid fitting exacty on top of an 8 centimeter cube. The pyramid has a hei

ArbitrLikvidat [17]

Answer:

Part 1) The volume of the paperweight is $576\ cm^{3}$

Part 2) The total surface area of the paperweight is $400\ cm^{2}$

Step-by-step explanation:

Part 1) what is the volume of the paperweight?

we know that

The volume of the paperweight is equal to the volume of the square pyramid plus the volume of the cube

step 1

Find the volume of the pyramid

The volume of the pyramid is equal to

$V=\frac{1}{3}BH$

where

B is the area of the square base

H is the height of the pyramid

$B=8^{2}=64\ cm^{2}$

$H=3\ cm$

substitute

$V=\frac{1}{3}(64)(3)=64\ cm^{3}$

step 2

Find the volume of the cube

The volume of the cube is equal to

$V=b^{3}$

$V=8^{3}=512\ cm^{3}$

step 3

Find the volume of the paperweight

$64\ cm^{3}+512\ cm^{3}=576\ cm^{3}$

Part 2) what is the total surface area of the paperweight?

we know that

The total surface area of the paperweight is equal to the surface area of 5 faces of the cube plus the lateral area of the pyramid

step 1

Find the surface area of 5 faces of the cube

$SA=5b^{2}$

$SA=5(8^{2})=320\ cm^{2}$

step 2

Find the lateral area of the pyramid

$LA=4[\frac{1}{2}bh]$

$LA=4[\frac{1}{2}(8)(5)]=80\ cm^{2}$

step 3

Find the total surface area of the paperweight

$320\ cm^{2}+80\ cm^{2}=400\ cm^{2}$

8 0

3 years ago

It is desired to compare the hourly rate of an entry-level job in two fast-food chains. Eight locations for each chain are rando

notka56 [123]

Answer:

It can be concluded that at 5% significance level that there is no difference in the amount paid by chain A and chain B for the job under consideration

Step by Step Solution:

The given data are;

Chain A 4.25, 4.75, 3.80, 4.50, 3.90, 5.00, 4.00, 3.80

Chain B 4.60, 4.65, 3.85, 4.00, 4.80, 4.00, 4.50, 3.65

Using the functions of Microsoft Excel, we get;

The mean hourly rate for fast-food Chain A, $\overline x_1$ = 4.25

The standard deviation hourly rate for fast-food Chain A, s₁ = 0.457478

The mean hourly rate for fast-food Chain B, $\overline x_2$ = 4.25625

The standard deviation hourly rate for fast-food Chain B, s₂ = 0.429649

The significance level, α = 5%

The null hypothesis, H₀: $\overline x_1$ = $\overline x_2$

The alternative hypothesis, Hₐ: $\overline x_1$ ≠ $\overline x_2$

The pooled variance, $S_p^2$ , is given as follows;

$S_p^2 = \dfrac{s_1^2 \cdot (n_1 - 1) + s_2^2\cdot (n_2-1)}{(n_1 - 1)+ (n_2 -1)}$

Therefore, we have;

$S_p^2 = \dfrac{0.457478^2 \cdot (8 - 1) + 0.429649^2\cdot (8-1)}{(8 - 1)+ (8 -1)} \approx 0.19682$

The test statistic is given as follows;

$t=\dfrac{(\bar{x}_{1}-\bar{x}_{2})}{\sqrt{S_{p}^{2} \cdot \left(\dfrac{1 }{n_{1}}+\dfrac{1}{n_{2}}\right)}}$

Therefore, we have;

$t=\dfrac{(4.25-4.25625)}{\sqrt{0.19682 \times \left(\dfrac{1 }{8}+\dfrac{1}{8}\right)}} \approx -0.028176$

The degrees of freedom, df = n₁ + n₂ - 2 = 8 + 8 - 2 = 14

At 5% significance level, the critical t = 2.145

Therefore, given that the absolute value of the test statistic is less than the critical 't', we fail to reject the null hypothesis and it can be concluded that at 5% significance level that chain A pays the same as chain B for the job under consideration

3 0

3 years ago

What is the product?<br><br> (5r + 2)(3r − 4)

bazaltina [42]

this is the answer 15r^2 − 14r − 8

Murda on the beat so it's not nice

For this life, I cannot change

Hidden Hills, deep off in the main

M&M's, sweet like candy cane

Drop the top, pop it, let it bang (pop it, pop it)

For this life, I cannot change

Hidden Hills, deep off in the main

M&M's, sweet like candy cane

Drop the top, pop it, let it bang (pop it, pop it)

Drop the top, play hide and seek

Jump inside, jump straight to the lake

Take a sip, feel just how I breathe

On freeway, but no, ain't nothin' free (straight up)

Bend laws, bend lanes

Been bustin' bills, but still ain't nothin' change

You in the mob soon as you rock the chain

She caught the waves just thumbin' through my braids (alright)

Heatin' up, baby, I'm just heatin' up (it's lit)

Fiji lover, now they need it is a must

Feelin' stuck, you know how to keep me up

Icy love, icy like a hockey puck

For this life, I cannot change

Hidden Hills, deep off in the main

M&M's, sweet like candy cane

Drop the top, pop it, let it bang (Pop it, pop it)

For this life, I cannot change

Hidden Hills, deep off in the main

M&M's, sweet like candy cane

Drop the top, pop it, let it bang

All the ones, all the chains piled on the mantle

All the dogs, all the dogs low creep right behind me in the Phantom

Never go, never go dip on the set, stayed Santana

Yeah, run it back, turn the lights on when I hit up Green Lantern

Yeah, fly the broads, fly the dogs down to Atlanta

Yeah, in the cut in Medusa, lay low I might be

Yeah, roll up, help me calm down when I move in high speed

Yeah, If I send one, need the text back 'cause you know what I need

Oh, please (oh please)

Oh me (oh me)

Oh my (oh my)

We been movin', we been movin' for some time (Alright!)

Flexin', flexin' try to exercise

(Exercise, exercise, exercise, exercise)

For this life, I cannot change

Hidden Hills, deep off in the main

M&M's, sweet like candy cane

Drop the top, pop it, let it bang (Pop it, pop it)

For this life, I cannot change

Hidden Hills, deep off in the main

M&M's, sweet like candy cane

Drop the top, pop it, let it bang

8 0

3 years ago

Read 2 more answers

Which graph correctly solves the system of equations below? y = −x2 + x + 7 y = x2 + 3x + 7

antiseptic1488 [7]

Answer:

(-1.703, 2.396)

(1.37, 6.493)

Step-by-step explanation:

We can easily solve this question by using a plotting tool or any graphing calculator,

The solution to the system of equation is given by the intersection points between the graphs of

y1 = −x^2 + x + 7

y2 = x^2 + 3x + 7

Please, see attached picture below.

The solutions are:

(-1.703, 2.396)

(1.37, 6.493)

5 0

3 years ago