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8090 [49]
2 years ago
11

Help needed.......................

Mathematics
2 answers:
VladimirAG [237]2 years ago
8 0
C is the answer ... all u has to do was subtract 5 from 12 , then -11-14 , then -13-9
zhenek [66]2 years ago
7 0

Answer: 7x^2+3y^2-4x

Choose the first option

Step-by-step explanation:

Ok, so let me show you how to do this.

First, distrubute the negative sign

12x^2-11y^2-13x-(5x^2-14y^2-9x)=

12x^2-11y^2-13x-5x^2+14y^2+9x

Now combine like terms

(12x^2-5x^2)=7x^2

(-11y^2+14y^2)=3y^2

(-13x+9x)=-4x

7x^2+3y^2-4x is the answer.

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If x varies directly with y and y is 10 when x is 8, what is x when y is 18?
swat32
Knowing that x varies directly with y, we know the basic skeleton of the equation is y = mx. 

To find m, plug in the known coordinate (8,10), where the x-coordinate is 8 and the y-coordinate is 10.
y=mx \\ 10=m8 \\ (10)/8=(8m)/8 \\ m= \frac{10}{8} = \frac{5}{4}

Then, plug in m to the equation to get y = (5/4)x.

Finally, plug in the y-coordinate 18 to the equation and solve for x!
y= \frac{5}{4}x \\ 18= \frac{5}{4}x \\  \frac{4}{5}(18)=( \frac{5}{4}x) \frac{4}{5} \\ x= \frac{4*18}{5}  \\  x= \frac{72}{5}

Your exact answer is x = 72/5. However, if your teacher prefers decimals, then x = 14.4

Hope this helps!
5 0
3 years ago
Read 2 more answers
What is <br> 2 1/4 cups converted to pints
DiKsa [7]

Answer:

1.125 0r 2.25

Step-by-step explanation:

the first is liquid and the second is cups

7 0
2 years ago
On an exam, Mafuyu scored in the 20th percentile. If there were 50 students in the class, how many students scored lower than he
Reptile [31]

Using the percentile concept, it is found that 10 students scored lower than he did.

<h3>What is the meaning of the percentile of a measure?</h3>

When a measure is in the xth percentile of a data-set, it is greater than x% of the measures and lesser than (100 - x)%.

In this problem, he scored on the 20th percentile, that is, higher than 20% of the 50 students. Then:

0.2 x 50 = 10.

10 students scored lower than he did.

More can be learned about percentiles at brainly.com/question/24495213

#SPJ1

6 0
2 years ago
Volume of a rectangular Pyramid that has a height of 9 cm length of 8 cm and a width of 9 cm
Alexus [3.1K]

Answer:

length = 8 cm

breadth = 9 cm

height = 9cm

Volume = ?

now,

Volume = l×b×h

= 8cm ×9cm ×9cm

= 648 cm^3.

5 0
3 years ago
Which uses a logarithmic scale?
gregori [183]

Answer: Richter Scale

Step-by-step explanation:

5 0
2 years ago
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