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Gre4nikov [31]
3 years ago
11

3 and 4 please helpp

Mathematics
1 answer:
Montano1993 [528]3 years ago
4 0

Answer:

Figure it out dummy

Step-by-step explanation:

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Help asap pls!!! Put steps if possible 3
GarryVolchara [31]

Answer:

i. 15.4

ii.45.2

Step-by-step explanation:

correct me if im wrong

tnx

8 0
2 years ago
Joshua randomly selects a vehicle to test drive. There are 12 cars, 9 trucks, and 4 vans on the lot. What is the probability Jos
eimsori [14]

Step-by-step explanation:

<em>The</em><em> </em><em>number</em><em> </em><em><u>of</u></em><em><u> </u></em><em><u>vehicle</u></em><em><u>s</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>2</u></em><em><u>5</u></em><em><u> </u></em><em><u>and</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>no</u></em><em><u>.</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>truck </u></em><em><u>is</u></em><em><u> </u></em><em><u>9</u></em><em><u> </u></em><em><u>so</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>probability </u></em><em><u>is</u></em><em><u> </u></em><em><u>9</u></em><em><u>/</u></em><em><u>2</u></em><em><u>5</u></em>

4 0
3 years ago
2. Carl needs 15 hours longer than Jennifer to paint a room. If they work together, they can complete the job in 4 hours. Explai
nasty-shy [4]

Answer:

Jennifer would complete the job on her own in 5 hours.

Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

ax^{2} + bx + c, a\neq0.

This polynomial has roots x_{1}, x_{2} such that ax^{2} + bx + c = a(x - x_{1})*(x - x_{2}), given by the following formulas:

x_{1} = \frac{-b + \sqrt{\Delta}}{2*a}

x_{2} = \frac{-b - \sqrt{\Delta}}{2*a}

\Delta = b^{2} - 4ac

Rates

The together rate is the sum of their separates rate.

We have that:

Jennifer takes x hours to complete the job on her own, so her rate is 1/x.

Carl needs 15 hours longer than Jennifer, that is, 15 + x hours, so his rate is 1/(15+x).

The together rate is 1/4. So

\frac{1}{4} = \frac{1}{x} + \frac{1}{15+x}

\frac{1}{4} = \frac{15 + x + x}{x(15+x)}

\frac{1}{4} = \frac{15 + 2x}{x(15+x)}

Applying cross multiplication.

x^2 + 15x = 4(15 + 2x)

x^2 + 15x = 60 + 8x

x^2 + 7x - 60 = 0

Quadratic equation with a = 1, b = 7, c = -60. So

\Delta = 7^{2} - 4*1*60 = 289

x_{1} = \frac{-7 + \sqrt{289}}{2} = 5

x_{2} = \frac{-7 - \sqrt{289}}{2} = -12

Since the time to complete the job has to be a positive value.

Jennifer would complete the job on her own in 5 hours.

4 0
2 years ago
Halp mi now. pls<br> pls plsp lls plsp pls
Thepotemich [5.8K]

Answer:

-r+5<-3

Step-by-step explanation:

plug in 19 to the equation inequality

7 0
2 years ago
Please help :0
Zinaida [17]
Mult. f(x) = x^4 by 2 will stretch the graph vertically by a factor of 2.
Thus, eliminate (a) and (b).

Mult. x by (1/4) will stretch the graph horiz. by a factor of 4.  Thus, (c) is the correct answer.
5 0
3 years ago
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