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4 years ago

Can some one answer this plsss

Mathematics

2 answers:

svlad2 [7]4 years ago

4 0

Answer:

Step-by-step explanation:

0.2x+5=8

0.2x=3

x=15

Therefore, the correct answer is choice D. Hope this helps!

Schach [20]4 years ago

3 0

Answer: 15

Explanation: remember to isolate the variable, so first, subtract five from five and eight on both sides since subtraction is additions inverse operation. Now, the equation looks like 0.2x=3. Next, divide 0.2 by 0.2 and 3 so you can isolate x on the left side. 0.2 equals to 15, so x = 15.

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A boy jogs 250 meters in 110 seconds. What is his average speed in m/s?

murzikaleks [220]

250m/110s

25m/11s

25/11 m/s

6 0

3 years ago

Solve each system by substitution 2x + y = 20 and 6x - 5y = 12

ivolga24 [154]

$\huge\mathbf{Answer࿐}$

$\underline{ \underline{ \bf{step} - 1}}$

Taking first equation,

$2x + y = 20$

$y = 20 - 2x$

$\underline{ \underline{ \bf{step} - 2}}$

plugging the value of y in second equation,

$6x - 5y = 12$

$6x - 5(20 - 2x) = 12$

$6x - 100 + 10x = 12$

$16x = 12 + 100$

$x = \dfrac{112}{16}$

$x = 7$

$\underline{ \underline{ \bf{step} -3}}$

plugging the value of x in first equation,

$2x + y = 20$

$(2 \times 7) + y = 20$

$14 + y = 20$

$y = 20 - 14$

$y = 6$

<h2>Conclusion :</h2>

$x = 7$
$y = 6$

____________________________

$\mathrm{ \#TeeNForeveR}$

6 0

3 years ago

iren2701 [21]

Answer:

Step-by-step explanation:

Given:

A. $2x^3-x^{2} -6x$

B. $2x^3+8x+4$

C. $3x^4+x^{2} +x-7$

D. $3x^4-3x^{2} +5x-7$

Now, let us evaluate the given expressions one by one.

$(4x^3-4+ 7x)-(2x^3-x-8)\\\Rightarrow 4x^3-4+ 7x-2x^3+x+8\\\Rightarrow 2x^3+8x+ 4$

It is equation B.

So, $(4x^3-4+ 7x)-(2x^3-x-8)$ is equivalent to B.

$(-3x^2+x^4+x)+(2x^4-7+4x)\\\Rightarrow -3x^2+x^4+x+2x^4-7+4x\\\Rightarrow3x^4-3x^{2} +5x-7$

It is equation D.

So, $(-3x^2+x^4+x)+(2x^4-7+4x)$ is equivalent to D.

$(x^{2} -2x)(2x+3)\\\Rightarrow 2x^3-4x^{2} +3x^{2} -6x\\\Rightarrow 2x^3-x^{2} -6x$

It is equation A.

So, $(x^{2} -2x)(2x+3)$ is equivalent to A.

So, answer is:

8 0

3 years ago

Ill mark brainlist plss help

arsen [322]

Step-by-step explanation:

Perimeter of rectangle = 2(l+b)

= 2(97+17)

= 2(114)

= 228cm

3 0

3 years ago

Read 2 more answers

A builder makes staircases where each step is 29 cm long and rises 18 cm so people dont trip. Every staircase has a stringer - a

Black_prince [1.1K]

Let x represent length of the stringer of the staircase.

We have been given that a builder makes staircases where each step is 29 cm long and rises 18 cm so people don't trip. Every staircase has a stringer - a diagonal support connecting all the steps. We are asked to find the length of the stringer of the staircase.

The length of the stringer of the staircase will be equal to diagonal of right triangle with two legs 29 cm and 18 cm.

Using Pythagoras theorem, we will get:

$x^2=29^2+18^2$