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2 years ago

15

Can you help me please.

1 answer:

Kamila [148]2 years ago

5 0

9514 1404 393

Answer:

a. (-1/2, 5)

Step-by-step explanation:

The coefficients of x have opposite signs, so the x-terms can be eliminated by adding the two equations.

(2y -12x) +(3y +12x) = (16) +(9)

5y = 25 . . . . . . simplify

y = 5 . . . . . . . . .divide by 5

This matches only answer choice A.

__

<em>Check</em>

The other part of answer choice A is x = -1/2. We can test this to make sure it works:

2(5) -12(-1/2) = 16

10 + 6 = 16 . . . . . . true, the selected answer works OK

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A girl wants to count the steps of a moving escalator which is going up. If she is going up on it, she counts 60 steps. If she i

Kaylis [27]

Let's V the speed of the girl in step
v the speed of the escalator in step
L the length between ground and floor.

V*60+v*60=L ==> V+v=L/60
V*90-v*90=L ==> V-v=L/90
2V=L(3+2)/180
==>V=5L/360
Time to climb (in step) with v=0 (escalator standing still)
V*t=L==> t=L/V=L/(L*5/360)=72

The girl will count 72 steps.

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3 years ago

Read 2 more answers

NEED HELP EDU!! WILL GIVE BRAINLEIST!<br> which graph of the cube root function f(x)=^3 √x?

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Answer:

C. $f(x)=\sqrt[3]{-x} -1$

Step-by-step explanation:

Consider graph of the parent function (red curve in attached diagram)

$g(x)=\sqrt[3]{x}$

First, multiply it by -1 to get function

$h(x)=-\sqrt[3]{x}$

Then translate the graph of the function h(x) 1 unit down, then you'll get the function

$f(x)=-\sqrt[3]{x} -1\\ \\ \text{or}\\ \\f(x)=\sqrt[3]{-x} -1$

The graph of the function f(x) is represented by the blue curve in attached diagram

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2 years ago

What is the area of a circle with a radius of 4cm

Degger [83]

50.27cm is the answer.

6 0

3 years ago

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Quick algebra 1 question for 10 points!

valina [46]

<u>Answer:</u>

○ 1 hour 41 minutes or more

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

We can make two equations that represent the total amount each plumber charges.

If $x$ represents the number of hours they work, then:

•Total charged by Plumber A = $35 + 15x$

• Total charged by Plumber B = $40+12x$

Now, if Plumber A is more expensive than Plumber B, then:

Total charged by Plumber A > Total charged by Plumber B

∴ $35 + 15x$ > $40+12x$

Now all we have to do is solve for $x$ :

$35 + 15x$ > $40+12x$

⇒ $35 + 15x -12x > 40$

⇒ $35 + 3x > 40$

⇒ $3x > 5$

⇒ $x > \bf \frac{5}{3} \space\ \mathrm{h}$

$\frac{5}{3} \space\ \mathrm h$ is equivalent to $\frac{5}{3} \times 60 \space\ \mathrm {min}$ = 100 minutes, which is the same as 1h 40min.

This means if Plumber A works more than 1h 40min, they become more expensive than Plumber B.

More than 1h 40min is equivalent to '1 hour 41 minutes or more', therefore the first option is correct.

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9 months ago

Andre purchased 1 quart of lemonade

ololo11 [35]

Answer:

7

Step-by-step explanation:

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2 years ago