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3 years ago

Help me please I got 55 questions to go in I’m not really good at math

Mathematics

2 answers:

xenn [34]3 years ago

6 0

Answer:

D) 2 hr 30 min

Step-by-step explanation:

The current time on the clock says 6:30 pm. Sherry's mom says that she must go to bed at 9:00 pm. Note that there are 60 minutes in an hour. Subtract:

9:00 pm = 8:60 pm

Subtract:

8:60 pm - 6:30 pm = 2:30

2 hours 30 minutes is your answer, or D).

tamaranim1 [39]3 years ago

4 0

Answer:2 hr 30 min

Step-by-step explanation:

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Which of the options represents the resulting equation after an equivalent expression for y is substituted into the second equat

Nina [5.8K]

Answer:

Correct choice is D

Step-by-step explanation:

Given the system of two equations:

$\left\{\begin{array}{l}4x+y=8\\6x-9y=12\end{array}\right..$

Fro mthe first equation

$y=8-4x.$

Substitute into the second equation $8-4x$ instead of y:

$6x-9(8-4x)=12.$

Note that $8-4x=-4x+8,$ then the second equation will take look

$6x-9(-4x+8)=12.$

6 0

3 years ago

Read 2 more answers

A pigpen is to be enclosed using 640 m of fencing along three of its sides, the fourth side being a barn. Determine the dimensio

Basile [38]

Answer:

$W_{max}=480m\\ L_{max}=160m$

Step-by-step explanation:

Since we know we only have 640 feet of fence available, we know that L + W + L = 640, $\implies$ 2L + W = 640. This allows us to represent the width, W, in terms of L: W = 640 – 2L

Remember, the area of a rectangle is equal to the product of its width and length, therefore,

$A_{\rm pigpen}=L(640-2L)\implies 640L-2L^2$

Notice that, quadratic has been vertically reflected, since the coefficient on the squared term is negative, so the graph will open downwards, and the vertex will be a maximum value for the area.

recall,

$x_{max}=-b/2a$
$f(x)_{max}=f(x_{max})$

Since our function is A(L)=640L-2L², we get

a=-2
b=640

plug in the value of a and b into the first formula:

$L_{max}=-(640)/2(-2)\implies 160$

$A(L)_{max}=640(160)-2(160)^2\implies 76800$

hence,the dimensions of the pen that will maximize the area are L=160m and W=76800/160=480m

and we're done!

3 0

3 years ago

In rectangle PQRS, PR = 18x – 28 and QS = x + 380. Find the value of x and the length of each diagonal.

Flauer [41]

Diagonals of a rectangle are congruent.

18x - 28 = x + 380

Solving for x, I get 17.

So, x = 17.

PR = 18x - 28

PR = 18(17) - 28

PR = 278

QS = x + 380

QS = 17 + 380

QS = 397

5 0

3 years ago

Read 2 more answers

Which is greater, 300 kelvins or 25 degrees Celsius? Show your work

Mademuasel [1]

300 kelvin is greater.

300 kelvin equals approximately 26.85°C

6 0

4 years ago

Set up, but do not evaluate, an integral for the volume of the solid obtained by rotating the region bounded by the given curves

Radda [10]

A washer has outer radius $2-x^2$ and inner radius $2 - \sqrt{x}$

$\displaystyle V = \int_0^1 \pi\Big[ \left( 2 - x^2 \right)^2 - \left( 2 - \sqrt{x}\right)^2\Big] dx$

4 0

3 years ago