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Mnenie [13.5K]
3 years ago
7

Please help me with substitution! I'm terrible at it. :( -3x+5y=-11 y=2x-5

Mathematics
1 answer:
OLEGan [10]3 years ago
7 0
-3x+ 5* 2x-5= -11
 -3x+10x-5=-11
(-3x=10x=7)
7x-5=-6
(+5 on each end)
7x=-6
divide by 7

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At an university 70% of the students who attend stay on campus. If 1,380 of the students who attend live off campus, what is the
Alborosie

Answer:

4600

Step-by-step explanation:

We can write a proportion to find the total amount who attend university using the information given. A proportion is two equivalent ratios set equal to each other. Since 70% live on campus, then 30% live off campus and we are told that number is 1,380.

\frac{30}{100}=\frac{1380}{y}

We will cross multiply the numerator of one ratio with denominator of the other. And then solve for y.

30y=100(1380)

30y=138000

y=4600.

There are 4600 students who attend the university.

7 0
3 years ago
Moussa is preheating his oven before using it to bake. The initial temperature of the
Yuki888 [10]

Answer:

365°, (65 +20t)°

Step-by-step explanation:

Temperature of oven

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Temperature of oven after 15 minutes

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= 65 +300

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Temperature after t minutes

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8 0
2 years ago
Help me please this is math
snow_tiger [21]

Answer:

c) none of the above

Step-by-step explanation:

this is because we should put the equation like:

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7 0
3 years ago
Avani is building a rectangular play area. The length of the play area is 7.5 meters. The width of the play area is 5.3 meters.
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area = L x W

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4 0
3 years ago
Read 2 more answers
Round up to the nearest hundredth
Shalnov [3]
x^2+3x-5=0\\\\a=1;\ b=3;\ c=-5\\\\b^2-4ac=3^2-4\cdot1\cdot(-5)=9+20=29\\\\x_1=\dfrac{-b-\sqrt{b^2-4ac}}{2a};\ x_2=\dfrac{-b+\sqrt{b^2-4ac}}{2a}\\\\x_1=\dfrac{-3-\sqrt{29}}{2\cdot1}=\dfrac{-3-\sqrt{29}}{2}\approx-4.19\\\\x_2=\dfrac{-3+\sqrt{29}}{2\cdot1}=\dfrac{-3+\sqrt{29}}{2}\approx1.19
5 0
3 years ago
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