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3 years ago

HELP A BRAINLY SISTA OUT!!!

Mathematics

2 answers:

EastWind [94]3 years ago

6 0

Jenifer can paint a room in 10 hours. When Carl helps the time is reduced to 6 hours.

frez [133]3 years ago

3 0

Answer:

10 hours is Jennifer or 12

Step-by-step explanation:

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ANSWER ASAP!! WILL MARK BRAINLIEST!

ra1l [238]

Answer:

1 and 3

Step-by-step explanation:

4 0

3 years ago

The rectangle below represents the base of a rectangular prism.

ki77a [65]

Answer:

its 2. 20cm³ or 3. 32cm³

Step-by-step explanation:

I'm dont know if im right because the picture is asking for something different then the question

4 0

3 years ago

Read 2 more answers

1) If y = x3 + 2x and dx/ dt = 5, find dy/dt when x = 2. Give only the numerical answer. For example, if dy, dt = 3, type only 3

Semenov [28]

Answer:

a) 70

b) 10π ft²/ft

c) 0.24 ft/sec

Step-by-step explanation:

1) y = x³ + 2x

$\frac{dy}{dt}=\frac{d(x^3+2x)}{dt}$

$\frac{dy}{dt}$ = $3x^2\frac{dx}{dt}+2\frac{dx}{dt}$

at $\frac{dx}{dt}=5$ and x = 2

$\frac{dy}{dt}$ = $3(2)^2\times(5)+2\times(5)$

$\frac{dy}{dt}$ = 60 + 10 = 70

2) A = πr² ft²

$\frac{dA}{dr}=\frac{d(\pi r^2)}{dr}$

$\frac{dA}{dr}$ = 2(πr)

at r = 5 ft

$\frac{dA}{dr}$ = 2(π × 5) ft²/ft

$\frac{dA}{dr}$ = 10π ft²/ft

3) From Pythagoras theorem

Base² + Perpendicular² = Hypotenuse²

Thus,

B² + P² = H² .............(1)

here, H = length of the ladder

P is the height of the wall

B is the distance from the wall at bottom

B² + P² = 25² ...........(1)

at B = 20 ft

20² + P² = 25²

P² = 625 - 400

P = √225

P = 15 ft

differentiating (1) with respect to time, we get

$2B\frac{dB}{dt}+2P\frac{dP}{dt}=0$

at B = 20 ft, $\frac{dB}{dt} = 0.18$ and P = 15 ft

⇒ 2(20)(0.18) + $2(15)\frac{dP}{dt}$ = 0

$30\frac{dP}{dt}$ = - 7.2

$\frac{dP}{dt}$ = - 0.24 ft/sec (Here negative sign depicts the ladder slides down)

7 0

4 years ago

Help me (fixed)<br> What is the slope of the line on the graph?

dolphi86 [110]

Answer:

o -1/2

Step-by-step explanation:

Slope is the ratio of rise/run.

We the line passes through (0,3) and (6,0)

Rise = y2 - y1 = 0 - 3 = -3

Run = x2 - x1 = 6 - 0 = 6

Slope = -3/6 = -1/2

8 0

2 years ago

Read 2 more answers

Write the equation of this circle in standard form. A) (x - 2)2 + (y - 3)2 = 4

Vika [28.1K]

Answer:

$x^2 + y^2 -4x -6y + 9 = 0$

Step-by-step explanation:

To write a circle in standard form, expand the equation of the circle and move all terms to one side.

$(x-2)^2 + (y-3)^2 = 4\\x^2 -4x + 4 + y^2 -6y + 9 = 4\\x^2 +y^2 - 4x - 6y + 13 = 4\\x^2 + y^2 -4x -6y + 9 = 0$

8 0

3 years ago