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3 years ago

Which of the following is an equivalent expression to -x+5y=15?

Mathematics

1 answer:

8_murik_8 [283]3 years ago

7 0

I think it is b because to me it makes the most sense

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Shawna and lea left the mall at the same time . They traveled in opposite directions. Lea traveled 30 mph faster that Shawna. Af

BlackZzzverrR [31]

Answer:88

Step-by-step explanation:

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3 years ago

Deidre is picking out some movies to rent, and she is primarily interested in documentaries and children's movies. She has narro

exis [7]

Answer: 6630

Step-by-step explanation:

Given , Number of documentaries = 17

Number of children's movies = 20

Total movies = 17+20=37

Number of combinations of r things taken out of things = $^nC_r=\dfrac{n!}{r!(n-r)!}$

Now, the number of different combinations of 3 movies can she rent if she wants at least one documentary

= (1 documentary+2 children's movies , 2 documentary+1 children's movies , 3 documentary+0 children's movies)

$=^{17}C_1\times^{20}C_{2}+^{17}C_2\times^{20}C_{1}+^{17}C_3\times^{20}C_{0}$

$=(17)\times\dfrac{20!}{2!18!}+\dfrac{17!}{2!15!}\times(20)+\dfrac{17!}{3!14!}(1)\\\\=3230+2720+680=6630$

Hence, the number of different combinations of 3 movies can she rent if she wants at least one documentary is 6630 .

3 0

3 years ago

How can you show that two objects are proportional with a graph?

11Alexandr11 [23.1K]

So this is our table:

-----------------
x-values | a b c d e f |
-----------------
y-values | g h i j k l |
-----------------

You can know that the values in the table are proportional if:

$\frac{a}{g}=\frac{b}{h} =\frac{c}{i}=\frac{d}{j}=\frac{e}{k}=\frac{f}{l}$

Hope that helps :)

6 0

3 years ago

Imani was assigned to make 64 cookies for the bake sale. If Imani made 25% more than they were assigned, how many cookies were m

Marina CMI [18]

Answer:

80 cookies

Step-by-step explanation:

25% of 64 is 16
16+64=80

5 0

2 years ago

What is the value of a? 27.5 45 90 50

Valentin [98]

90. The measure of an inscribed angle is half of that of the measure of its arc, and the measure of the angle corresponding with arc a is 45. 45*2 is 90, so 90 is the measure of arc a.

7 0

3 years ago

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