7th grade math help me plzzzz

Answer:

Kindly check explanation

Step-by-step explanation:

Given the following :

Equipment elevator :

Descent rate = 5 ft/s

Miner's elevator :

Descent rate = 17 ft/s

Position of elevator after 16 seconds

Total descent time of equipment elevator = (29 + 16) = 45 seconds

Position after 45 Seconds :

Descent rate * time

5ft/s * 45s = 225 ft

Descent time of Miner's elevator = 16 seconds

Position after 16 Seconds :

Descent rate * time

17ft/s * 16s = 272 fts

Miner's elevator is deeper = 272 feets > 225 fts

Position of equipment elevator relative to the surface = - 225fts

The solution for the equation -2(2x + 5) - 3 = -3(x - 1) is x = - 16 which can be solved by the use the distributive property.

Distributive Property that when we multiply a number by a group of numbers that are added together, we can multiply each value in the group separately, then add the products of the multiplications.

-2(2x + 5) - 3 = -3(x - 1)

To solve this equation, we need to first use the distributive property to expand the left side of the equation.

We have:

-4x-10-3 = -3(x - 1)

-4x-13 = -3(x - 1)

Now, we can group the like terms on the left side and the right side of the equation.

On the left side, we have -4x - 13 and on the right side, we have -3x + 3.

-4x-13 = -3x + 3

To solve for x, we can add 3x to left side of the equation and add 13 to the right side.

This results in the equation:

-4x+ 3x  = 13 + 3

Now, we can add 3x with -4x of the equation to isolate the x-term.

We have:

-x = 16

x = - 16

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Answer:

30 pages

Step-by-step explanation:

Knowing she wrote 12 pages in 4 hours, we can do 12/4 to get 3 pages per hour. Multiply 3 pages by the 6 hours she spends writing and you get 18 pages in 6 hours. Add 12 pages and 18 pages and you have 30 pages.

9514 1404 393

Answer:

  2.25

Step-by-step explanation:

The number 2.25 is already in standard form.

___

In the US (and other places), "standard form" is an ordinary decimal number, with the integer part to the left of the decimal point and the fractional part to the right of the decimal point: 2.25.

In the UK (and other places), "standard form" is a number written in scientific notation with a mantissa consisting of the leading non-zero digit to the left of the decimal point, the remaining significant digits to the right of the decimal point, and a multiplier that is 10 to the power appropriate to the place value of the leading digit. When the multiplier is 1, we need not write it.

  2.25 = 2.25×10⁰ (full form) = 2.25 (with superfluous 10⁰ removed)

Answer:

geothermal

Step-by-step explanation:

energy obtained from heat within the earth-geothermal

Answer:

B. g(x)=(2x)^2

Step-by-step explanation:

this is right

Answer:

{-3, -1}

Step-by-step explanation:

We want to find the value of x when the value of the graph is -2

h(x) = -2 when  x=1 and x = -3

{-3, -1}

Answer: 24ft by 36

Step-by-step explanation:

It is asking which dimension of a rectangle is similar. 24 divided by 6 is 4 and if you do the same to 6 then 36 divided by 6 is also 6 which makes it similar

Answer:

1/2

Step-by-step explanation:

1/2 would be the best fraction to represent how much he saves.

Answer:

120 quarts

Step-by-step explanation:

1 gallon=4 quarts

30x4= 120

Answer:

The function that model the number of bulbs she will plant is g = 5x²

She will plant 320 bulbs in the garden

Step-by-step explanation:

∵ Cindy’s square garden has a side length of x ft

∵ Area of the square = side × side

∴ The area of the garden = x × x

∴ The area of the garden = x² ft²

∵ She will plant 5 tulip bulbs per square foot

→ That means there are 5 tulip bulbs in 1 foot²

∵ The area of the garden is x² ft²

→ Multiply the area of the garden by 5

∴ The number of tulip bulbs in the garden = 5 × x²

∴ The number of tulip bulbs in the garden = 5x²

∵ g represents the number of bulbs she will plant in her garden

∴ g = 5x²

∴ The function that model the number of bulbs she will plant is g = 5x²

∵ The garden has a side length of 8 feet

→ That means the value of x is 8 feet

∴ x = 8

→ Substitute the value of x in the function above

∴ g = 5(8)² = 5(64)

∴ g = 320

∴ She will plant 320 bulbs in the garden

Answer:

3

Step-by-step explanation:

Given the question :

The value of n is a distance of 3 units from 1 an 1/2 on a number line click on the number line to the possible values of n

From the context of the expression:

n is the distance which exists between 1 1/2 and 3 units from it;

Which may be ;

1 1/2 - - - - (1 1/2 + 3) = 4 1/2

1 1/2 - - - - - (3 - 1 1/2)

Either way, there exists a distance of 3 units between 1 1/2 and 3 units from it.

Hence, n = 3

Answer:

1 and 3 would both be correct

Answer:

[tex]C(99,55)\,C(33,22)\,C(44,33)[/tex]

Step-by-step explanation:

A permutation refers to arrangement of the objects or numbers in order.  Combinations refers to selecting the objects or numbers from a group of objects or collection such that the order of the objects does not matter.

A delegation of 55 Republicans, 22 Democrats, and 33 Independents is selected from a group of 99 Republicans, 33 Democrats, and 44 Independents.

So,

Number of ways [tex]=C(99,55)\,C(33,22)\,C(44,33)[/tex]

Answer:

1. Lines c and d

alternate exterior angles

Step-by-step explanation:

Answer:

3rd one

Step-by-step explanation:

Answer:

A.) slope= 4 and y intercept= 3

Step-by-step explanation:

y = x4+3

Answer:

y = x4+3

Step-by-step explanation:

look at answer

Answer:

B

Step-by-step explanation:

B because it is the farthest away from 0.

Answer:

4 fruit baskets.

Step-by-step explanation:

Use GCF to find the answer. 20 divided by 4 is 5, 16 divided by 4 is 4, and 32 divided by 4 is 8.

Given that,

A supply of foods last for a week for 20 families.

It is required to find the time that  would the supply last for 3 more families.

20 families = 1 week = 7 days

If 3 more families joined, total no of families are now 23.

It means that,

1 family= (20/7) days

Now,

23 family =

[tex]\dfrac{20}{7}\times 23=65.71\ \text{days}\\\\\approx 66\ \text{days}[/tex]

So, the supply will last for 66 days.

Complete Question

The complete question is shown on the first uploaded image  

Answer:

a

[tex]P(X < 4) =  0.4141 [/tex]

b

[tex]P(4 < X < 6) =   0.32876[/tex]

c

 [tex]P(X >8) =  0.064037 [/tex]

d

The correct option is  B

Step-by-step explanation:

From the question we are told that

  The mean is  [tex]\mu =  4.5[/tex]

  The standard deviation is [tex]\sigma  =  2.3[/tex]

Generally the  probability that a randomly selected study participant's response was less than 4 is mathematically represented as

       [tex]P(X < 4) =  P(\frac{X - \mu }{\sigma} < \frac{4 - 4.5}{ 2.3}   )[/tex]

[tex]\frac{X -\mu}{\sigma} =  Z (The \  standardized \  value \  of\  X )[/tex]

So

     [tex]P(X < 4) =  P(Z < -0.217  )[/tex]

From the z-table  [tex]P(Z < -0.217  ) =  0.4141[/tex]

So

    [tex]P(X < 4) =  0.4141 [/tex]

Generally the probability that a randomly selected study participant's response was between 4 and 6 is mathematically represented as

     [tex]P(4 < X < 6) =  P( < \frac{4 - 4.5}{ 2.3}  < \frac{X - \mu }{\sigma} < \frac{6 - 4.5}{2.3})[/tex]

=> [tex]P(4 < X < 6) =  P(  \frac{4 - 4.5}{ 2.3}  < \frac{X - \mu }{\sigma} < \frac{6 - 4.5}{2.3})[/tex]

=>   [tex]P(4 < X < 6) =  P(  -0.217  < Z< 0.6522[/tex]

=>   [tex]P(4 < X < 6) =   (Z< 0.6522) -P( Z <  -0.217) [/tex]

From the z-table  

       [tex](Z< 0.6522)  = 0.74286 [/tex]

So  

       [tex]P(4 < X < 6) =  0.74286 -0.4141[/tex]

=>      [tex]P(4 < X < 6) =  0.74286 -0.4141[/tex]

=>      [tex]P(4 < X < 6) =   0.32876[/tex]

Generally the  probability that a randomly selected study participant's response was more than 8 is mathematically represented as

       [tex]P(X > 8) =  P(\frac{X - \mu }{\sigma} > \frac{8 - 4.5}{ 2.3}   )[/tex]

        [tex]P(X > 8) =  P(Z > 1.52174  )[/tex]

From the z-table  [tex]P(Z > 1.52174 ) =  0.064037[/tex]

So

    [tex]P(X >8) =  0.064037 [/tex]

Answer:

the answer is a line segment :)

Answer:

25% decrease

- Trust me it's right

Answer:

D

Step-by-step explanation:

Answer

Its  C notD!!!!!!

Step-by-step explanation:

The other person is wrong im right

Answer:

A

Step-by-step explanation:

Answer:1/3 is bigger

Step-by-step explanation:

Wait Jimmy what are you doing here I didn't expect this

so we meet again, brother.

Answer:

Because Karen found your briefcase of $1 bills and some crusty socks.

Get over the divorce Jimmy, she doesn't like fax machines.

Answer:

[tex]5\leq x\leq 40[/tex]

Here, [tex]x[/tex] denotes the additional cookies that need to be made by Walter besides 15 cookies made by him so far

Step-by-step explanation:

Number of cookies made by Walter so far = 15

He is asked by his coach to make at least 20 cookies but no more than 55.

Let [tex]x[/tex] denotes the additional cookies that need to be made by Walter besides 15 cookies made by him so far.

The inequality is [tex]20\leq x+15\leq 55[/tex]

Now solve this inequality.

[tex]20\leq x+15\leq 55\\20-15\leq x\leq 55-15\\5\leq x\leq 40[/tex]

Answer: a

Step-by-step explanation: because its right

Answer:

4704

Step-by-step explanation:

8*588=4704

Answer:

1 + 4 = 5

4/8 +3/8 = 7/8

5 7/8 - 7/8 = 5 inches left on the ground after 3 hours

Step-by-step explanation: