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Misha Larkins [42]
3 years ago
12

Please help with 11 and 12

Mathematics
1 answer:
larisa [96]3 years ago
7 0
11.k>-3(4r+3)/4r-5
12.k<(2x+2)/x+3
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An electrician can wire a house in 20 hours. if she works with an apprentice, the same job can be completed in 12 hours. how lon
AlekseyPX
We know that
<span>An electrician can wire a house in ------------> 20 hours
so
100%----------------> 20 hours
 X-------------------> 12 hour
x=12*100/20----> x=60%

that means 
</span><span>the apprentice in 12 hours complete the (100-60)----> 40%

</span>the apprentice in 12 hours complete -------> 40%
x hours------------------------------------> 100%
x=100*12/40-----> x=30 hours

the answer is
30 hours


4 0
3 years ago
The area of the trapezoid is 24 in.2.<br>True or false
Lorico [155]

Answer:

The answer is true

Step-by-step explanation:

To find the area of a trapezoid, multiply the sum of the bases (the parallel sides) by the height (the perpendicular distance between the bases), and then divide by 2

3 0
3 years ago
Please help, as soon as possible...
vodomira [7]

Answer:

1. a) Square

2. c) Rectangle

Step-by-step explanation:

1. If you cut this rectangular prism in way to be PERPENDICULAR to the base, that means you're cutting it straight down, from the top to the bottom, in a vertical line.  The cross-section obtained will be just like an end of the prism, which in this case is a square.  Because it's a regular rectangular prism, no matter where you cut it, as long as it's vertical, perpendicular to the base, you'll get a square due to this particular form.  Technically, the answer could also be a rectangle, since a square is a rectangle.

2.  you cut this rectangular prism in way to be PARALLEL to the base, that means you're cutting it straight, from the front to the back, in an horizontal line. The cross-section obtained will be just like an top of the prism, which in this case is a rectangle.  Because it's a regular rectangular prism, no matter where you cut it, as long as it's an horizontal line, parallel to the base, you'll get a rectangle due to this particular form.

6 0
3 years ago
WILL MARK BRAINLIEST ASAP!!
7nadin3 [17]

\dfrac{x^2+ax-4}{x+2}+\dfrac{x+b}{x+2}=\dfrac{x^2+ax-4+x+b}{x+2}=\dfrac{x^2+(a+1)x+(b-4)}{x+2}\\\\\dfrac{x^2+(a+1)x+(b-4)}{x+2}=x+1\\\\\dfrac{x^2+(a+1)x+(b-4)}{x+2}=\dfrac{(x+1)(x+2)}{x+2}\\\\\dfrac{x^2+(a+1)x+(b-4)}{x+2}=\dfrac{(x)(x)+(x)(2)+(1)(x)+(1)(2)}{x+2}\\\\\dfrac{x^2+(a+1)x+(b-4)}{x+2}=\dfrac{x^2+2x+x+2}{x+2}\\\\\dfrac{x^2+(a+1)x+(b-4)}{x+2}=\dfrac{x^2+3x+2}{x+2}\iff a+1=3\ \wedge\ b-4=2\\\\\boxed{a=2\ \wedge\ b=6}

3 0
3 years ago
Read 2 more answers
What are the soltions to the innequality -7x+14 is grater than -3x-6
hichkok12 [17]

-7x+14>-3x-6

Add 3x to both sides

-7x+14+3x>-3x-6+3x

-4x+14>-6

Subtract 14 from both sides

-4x+14-14>-6-14

-4x>-20

Divide both sides by -4

-4x/4>-20/-4

x<5


I hope that's help , please let me know !

7 0
3 years ago
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