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Veseljchak [2.6K]
3 years ago
11

Please help me..I don't understand how to solve problems like

Mathematics
2 answers:
Vlad1618 [11]3 years ago
4 0
Remember you can do ANYTHING to an equation as long as you do it to both sides

isolate the y and then divide by the coefient
the basic way to simplify it is if you did
ax+by=c
y=\frac{-a}{b}x+ \frac{c}{b}

but memorization is no fun so



4y+2x=18
minus 2x both sides
4y=-2x+18
divide both sides by 4
y= \frac{-1}{2}x+ \frac{9}{2}
Nuetrik [128]3 years ago
3 0
Okay. So first you subtract 2x from each side. That will give you 4y= -2x+18 (you want to get y by itself). Then you divide both sides by 4. It should equal> y= 1/2x +9/2
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Mr. Moore has 21 feet of wallpaper he cuts it into sections that are each 3 feet long how many
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Total = 21 feet

if each is 3 feet

21/3 = 7

Therefore, there are 7 sections

5 0
3 years ago
Which of the following best describes the following expression? √36
Olin [163]
The answer is the positive square root of 36
4 0
3 years ago
Read 2 more answers
What is the average (arithmetic mean) of the first 90 measurements in a certain list of 92 measurements? (1) the average of the
marishachu [46]
The sum of all the measurements is just the average times the number.

\bar x = \frac{1}{n} \sum_{i=1}^n x_i

\sum_{i=1}^n x_i = n \bar x

So if the average of all 92 is 7 the sum of those is 92 \times 7

The average of the last two is 7.2 so their sum is 2 \times 7.2

That means the sum of the first 90 is 92 \times 7 - 2 \times 7.2

so the average of the first 90 is

 \dfrac{92 \times 7 - 2 \times 7.2}{90} = 6.99556 cm



7 0
3 years ago
I need help with the first two please
lesantik [10]

Answer:

1. 45 minutes a day cycling

2.$1.55 on each cup of coffee a day

Step-by-step explanation:

1. You would figure up how much he jogs per week by multiplying 15 times 5 which would be 75 minutes and then from there you would subtract 75 from 300 and get 225 and divide 225 and 5 and end up with 45

2. You would multiply $.75 by 4 to figure up how much he spends on donuts which is $3 and then subtract  15.40 from 3 and get 12.40 and divide 12.40 by 8 since he goes twice a day and end up with 1.55

3 0
3 years ago
Find the value for x. Round your answer to the nearest hundredth. Area of the triangle = 8 ft^2​
zmey [24]

Answer:

x = 3.51

Step-by-step explanation:

Since, formula to determine the area f a triangle is,

Area = \frac{1}{2}(\text{Base})(\text{Height})

     8 = \frac{1}{2}(x + 1)(3x - 7)

16 = x(3x - 7) + 1(3x - 7)

16 = 3x² - 7x + 3x - 7

16 = 3x² - 4x - 7

0 = 3x² - 4x - 23

3x²- 4x - 23 = 0

By quadratic formula,

x = \frac{-b\pm \sqrt{b^{2}-4ac}}{2a}

x = \frac{4\pm \sqrt{(-4)^{2}-4(3)(-23)}}{2(3)}

x = \frac{4\pm \sqrt{292}}{6}

x = \frac{4\pm 17.09}{6}

x = 3.51, -2.18

But the length of sides can't be negative.

Therefore, x = 3.51 will be the answer.

8 0
2 years ago
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