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3 years ago

5th grade math give step by step explanation to pls

Mathematics

2 answers:

Brilliant_brown [7]3 years ago

5 0

Answer:

Step-by-step explanation:

First you need to divide579/48 to find the number of busses if each carries 48 which equals 12.062 but you cant put a portion of the people in 1/100th of a bus so 13 busses

Luden [163]3 years ago

3 0

Answer:

13 buses.

Step-by-step explanation:

579/48=12 and 3/579 and you don't want to leave the 3 poor kids out so 13 buses.

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Factor –8x3 – 2x2 – 12x – 3 by grouping. What is the resulting expression?

xenn [34]

Easier if you first factor out the " - " sign. Then you have:

–8x3 – 2x2 – 12x – 3 = -1(<span>8x3 + 2x2 + 12x +3).
</span>
Start with 12 + 3. This factors to 3(4x+1). Next, focus on 8x^3+2x^2. This factors to 2x^2*(4x+1). So, the binomial factor 4x+1 is common to the first two terms and the second two terms. We get: (4x+1) ( 2x^2 + 3).

Now put the "-" sign back in, and we get - (4x+1) ( 2x^2 + 3) (answer)

Please note: Use "^" to denote exponentiation. 2x2 is meaningless; it should be 2x^2.

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Examine the following system of inequalities.

topjm [15]

<h2>Answer:</h2>

Dotted linear inequality shaded below passes through (0, 4) & (4,3). Dotted parabolic inequality shaded above passes through points (negative 6,4), (negative 4, 0) & (negative 2, 4).

<h2>Step-by-step explanation:</h2>

Hello! Let me help you to find the correct option to this problem. First of all, we have the following system of inequalities:

$\left\{ \begin{array}{c}y< -\frac{1}{4}x+4\\y>(x+4)^{2}\end{array}\right.$

To solve this, let's write the following equations:

<h3>FIRST:</h3>

$y=-\frac{1}{4}x+4$

This is a linear function written in slope-intercept form as $y=mx+b$ . So, the slope $m=-\frac{1}{4}$ and the y-intercept is $b=4$ . Since in the inequality we have the symbol < then the graph of the line must be dotted. To get the shaded region, let's take a point, say, $(0, 0)$ and let's test whether the region is above or below the graph. So:

$y< -\frac{1}{4}x+4 \\ \\ Let \ x=y=0 \\ \\ 0$

Since the expression is true, then the region is the one including point $(0, 0)$ , that is, it's shaded below.

<h3>SECOND:</h3>

$y=(x+4)^{2}$

This is a parabola that opens upward and whose vertex is $(-4,0)$ . Since in the inequality we have the symbol > then the graph of the parabola must be dotted. Let's take the same point $(0, 0)$ to test whether the region is above or below the graph. So:

$y>(x+4)^{2} \\ \\ Let \ x=y=0 \\ \\ 0>(0+4)^2\\ \\ 0>16 \ False!$

Since the expression is false, then the region is the one that doesn't include point $(0, 0)$ , that is, it's shaded above

____________________

<h3>On the other hand, testing points (0, 4) and (4,3) on the linear function:</h3>

$y=-\frac{1}{4}x+4 \\ \\ \\ \bullet \ (0,4): \\ \\ y=-\frac{1}{4}(0)+4 \therefore y=4 \\ \\ \\ \bullet \ (4,3): \\ \\ y=-\frac{1}{4}(4)+4 \therefore y=3$

So the line passes through these two points.

<h3 /><h3>Now, testing points (negative 6,4), (negative 4, 0) & (negative 2, 4) on the parabola:</h3><h3 />

$y=(x+4)^2 \\ \\ \\ \bullet \ (-6,4): \\ \\ y=(-6+4)^2 \therefore y=(-2)^2 \therefore y=4 \\ \\ \\ \bullet \ (-4,0): \\ \\ y=(-4+4)^2 \therefore y=0 \\ \\ \\ \bullet \ (-2,4): \\ \\ y=(-2+4)^2 \therefore y=(2)^2 \therefore y=4$

So the line passes through these three points.

Finally, the shaded region is shown below.

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3 years ago