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3 years ago

-x + 2 = 3/4x + 29/18

Mathematics

1 answer:

Triss [41]3 years ago

3 0

Answer:

I got (21x = 10)

Step-by-step explanation:

i could be wrong

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A number changed to 12.6 after it was rounded. To what place waa the number rounded? Explain how you know

Evgen [1.6K]

12.6 ...if it was rounded, it was rounded to the nearest tenths.....because ur 6 is in the tenths place

if it was 12.67 rounded, then it would have been rounded to the nearest hundredths place because ur last digit is in the hundredths place

and if it was 12.678 rounded, then it would have been rounded to the nearest thousandths place because ur last number is in the thousandths place

u get it ?

8 0

4 years ago

Read 2 more answers

Plzzzz Help meeeeee!!!!!!

mariarad [96]

Answer:

The cost of the $0.5 per cookies and $1.25 per brownie.

Option (A) is correct.

Step-by-step explanation:

Let us assume that the cost of the cookies =x

Let us assume that the cost of the brownie = y

As given

Sara is selling cookies and brownies as a fundraiser for the school band.

She charges $2.25 for two cookies and one brownie.

Than the equation becomes

2x + y = 2.25

She charges $5.75 for four cookies and three brownies.

4x + 3y = 5.75

Than two equation are

2x + y = 2.25 and 4x + 3y = 5.75

Multiply 2x + y = 2.25 by 3 and subtracted from 4x + 3y = 5.75

4x - 6x + 3y - 3y = 5.75 - 6.75

-2x = - 1

2x = 1

$x = \frac{1}{2}$

x = $0.5

Put in the equation 2x + y = 2.25

2 × 0.5 + y = 2.25

1 + y = 2.25

y = 2.25 - 1

y = $1.25

Therefore the cost of the $0.5 per cookies and $1.25 per brownie.

Option (A) is correct.

5 0

3 years ago

Answer attachment EASY POINTS

Readme [11.4K]

Answer:

$z=\frac{at-67}{45+a}$

Step-by-step explanation:

Step 1: Write out equation

a(t + z) = 45z + 67

Step 2: Distribute a

at + az = 45z + 67

Step 3: Subtract 67 on both sides

at + az - 67 = 45z

Step 4: Subtract az on both sides

at - 67 = 45z + az

Step 5: Factor out z

at - 67 = z(45 + a)

Step 6: Divide both sides by 45 + a

$z=\frac{at-67}{45+a}$

3 0

3 years ago

If 2/x+ 3/y =13 and 5/x- 4/y = -2, then x+y equals

creativ13 [48]

Answer:

$x + y = \frac{5}{6}$

Step-by-step explanation:

Let:

$u = \frac{1}{x} \\ v = \frac{1}{y}$

This allows us to manipulate the equations like we normally would.

$2u + 3v = 13 \\ 5u - 4v = - 2 \\ \\ + 8u + 12v = 52 \\ + 15u - 12v = - 6 \\ 23u = 46 \\ u = 2 \\ \\ 2(2) + 3v = 13 \\ 4 + 3v = 13 \\ 3v = 9 \\ v = 3$

Then, we return the values where they belong.

$u = \frac{1}{x} \\ 2 = \frac{1}{x} \\ x = \frac{1}{2} \\ \\ v = \frac{1}{y} \\ 3 = \frac{1}{y} \\ y = \frac{1}{3}$

Finally, we add:

$\frac{1}{2} + \frac{1}{3} = \frac{3}{6} + \frac{2}{6} = \frac{5}{6}$

7 0

3 years ago

Solve by substitution -3x-2y=5.5 x+3y=7.5

Naddika [18.5K]

$\bf \begin{cases} -3x-2y=5.5\\[-0.5em] \hrulefill\\ x+3y=7.5\\ \boxed{x}=7.5-3y \end{cases}~\hspace{5em}\stackrel{\textit{substituting \underline{x} in the 1st equation}}{-3\left( \boxed{7.5-3y} \right)-2y=5.5} \\\\\\ -22.5+9y-2y=5.5\implies -22.5+7y=5.5\implies 7y=28 \\\\\\ y=\cfrac{28}{7}\implies y=4 \\\\\\ \stackrel{\textit{substituting the found \underline{y} in the 2nd equation}}{x+3(4)=7.5\implies x+12=7.5}\implies x=-4.5 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (-4.5,4)~\hfill$

5 0

3 years ago