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Anni [7]
3 years ago
12

3xy−5y for x=−1.5 and y=−3

Mathematics
2 answers:
Georgia [21]3 years ago
3 0
Plug in 1.5 for x, to start off. It is then simplified to : 3*(1.5)* y - 5y
Then plug in -3 for y, it's then simplified to : 3*(1.5)* -3 - 5 * (-3)
First, multiply 1.5 times 3, and that will get you 4.5. The multiply 4.5 with -3, and that will get you -13.5. Moving on, subtract -13.5 from the 5 that is being multiplied to -3, which is -15. In conclusion, -13.5 subtracted from -15 would be -28.5. Hope this helps!
Neko [114]3 years ago
3 0

Answer:

28.5

Step-by-step explanation:

whoever said -28.5 your wrong i just put it i nRSm and it said incorrect. but when i put in 28.5 it said correct

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The volume of a gas varies directly with its temperature and inversely with the pressure. If the volume of a certain gas is 15 c
vladimir2022 [97]

Answer:

Therefore the volume of the gas is 32 cubic feet.

Step-by-step explanation:

Given that,

The volume of a gas varies directly with its temperature and inversely with the pressure.

V\propto \frac{T}{P}

V= Volume of the gas at constant mass

T= Temperature at constant mass

P= pressure at constant mass

\frac{V_1}{V_2}=\frac{\frac{T_1}{T_2}}{\frac{P_1}{P_2}}

\therefore \frac{V_1}{V_2}=\frac{T_1P_2}{T_2P_1}.

Given that,

At constant mass, the volume of a certain gas is 15 cubic feet and a pressure of 40 pound per square inch at a temperature 300 k.

V_1=15 cubic feet, P_1=40 pound per square inch and T_1= 300 K

V_2=?, P_2=20 pound per square inch and T_2= 320k

\therefore \frac{V_1}{V_2}=\frac{T_1P_2}{T_2P_1}.

Plugging all values

\frac{15}{V_2}=\frac{300\times 20}{320\times 40}

\Rightarrow V_2=\frac{15\times 320\times 40}{300\times 20}{}

\Rightarrow V_2=32 cubic feet

Therefore the volume of the gas is 32 cubic feet.

4 0
3 years ago
the first 3 numbers in a sequence are 30000, 12000, and 4800. Use a percent to describe the pattern of the sequence. List the ne
Naddik [55]
From 30000 to 12000 is 2.5 from 12000 to 4800 is 2.5 so using 2.5 you divide 2.5 from 4800= 1920 1920/2.5= 768
the anwers for the sequence are 1920 and 768
the percentage is .025%
5 0
4 years ago
Simplify (9y²-x² )÷ (xy+3y²)
alexdok [17]

Step-by-step explanation:

  • \cfrac{(9y²-x² )}{ (xy+3y²)}
  • \cfrac{3 {}^{2} (y) {}^{2}  - x}{3(y {})^{2} + xy }
  • 3 {}^{2 - 1} y {}^{2 - 2 - 1}  - x {}^{2 - 1}
  • 3 y  { }^{ - 1}  - x

  • \cfrac{3}{y}  - x

Therefore,the answer is \cfrac{3}{y}  - x.

  • [Some of the steps I didn't show,try by yourself,to find!]
6 0
2 years ago
What’s the answer, I’m really confused
Fynjy0 [20]

The answer is 20/7, hope that helps you out have a good day

4 0
4 years ago
Of the students in Ms.Danver's class, 6 walk to school.This represents 30% of her students.How many Students are in Ms.Damver's
Kisachek [45]
There is 20 students. To find the answer you need to use porportionals and cross multiply.
6 0
4 years ago
Read 2 more answers
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