All categories

3 years ago

Lf 7 + 3x = 22. then 2x = ?

Mathematics

1 answer:

Sloan [31]3 years ago

3 0

Answer:

2x = 10

Step-by-step explanation:

7 + 3x = 22

-7 -7

Subtract 7 from both sides (you are trying to get the variable alone, and to do that, you have to get every other number to 0. <em>7 - 7 = 0</em>. BUT, whatever you do, you have to do to both sides.)

3x = 15

/3 /3

Divide both sides by three to get the variable alone.

x = 5

Now, plug in the value of x to the second equation and solve.

2(5) = ? --> 10

You might be interested in

Help me please please

larisa [96]

Answer:

44/3

Step-by-step explanation:

I hope this helps!

5 0

3 years ago

Estimate how many times larger 4 x 10^15 is than 8 x 10^9 in the form of a single digit times an integer power of 10.

netineya [11]

Answer:

5×10⁵

5×10⁶

Step-by-step explanation:

$\dfrac{4\cdot 10^{15}}{8\cdot 10^{9}}=\dfrac{40\cdot 10^{14}}{8\cdot 10^{9}}\\\\=\dfrac{40}{8}\cdot 10^{(14-9)}=5\cdot 10^{5}$

$\dfrac{2\cdot 10^{-5}}{4\cdot 10^{-12}}=\dfrac{20\cdot 10^{-6}}{4\cdot 10^{-12}}\\\\=\dfrac{20}{4}\cdot 10^{(-6-(-12))}=5\cdot 10^{6}$

3 0

4 years ago

I need help understanding square roots

Vlad [161]

I wonder if you mean to write $\sqrt[3]{256}$ in place of $3\sqrt{256}$ ...

If you meant what you wrote, then we have

$\sqrt{256}=\sqrt{16^2}=16$

$3\sqrt{256}=3\cdot16=48$

If you meant to write $\sqrt[3]{256}$ (the cube root of 256), then we could go on to have

$\sqrt[3]{256}=\sqrt[3]{16^2}=\sqrt[3]{(4^2)^2}=\sqrt[3]{4^4}=\sqrt[3]{4^3\cdot4}=4\sqrt[3]4$

6 0

3 years ago

How do I determine if a math question is statistical or not

Naddik [55]

A statistical question will have more than one answer. Questions like, “How old are the students in my school?”or “What time did the students in this class get up this morning?” are examples of a statistical question. Pretty much if it involves asking more the one people it’s a statistical question because it will lead to more than one answer.

5 0

3 years ago

Given the points below, find XY. Round to<br> the nearest hundredth.<br> X(-8, 2) and Y(7,-4)

Tasya [4]

Answer: 16.16

Step-by-step explanation:

xy in this situation, will be the distance between the two points.

(-8,2) (7,-4) Find the distance between the points

To ind the distance, find the difference in the x and y values,square them and add them to find the obtained number square root.

2-(-4) = 6

-8 - 7 = -15

6^2 + (-15)^2 = d^2 where d is the distance

36 + 225 = d^2

261 = d^2

d= $\sqrt{261}$

d= 16.1554 rounded to the nearest hundredth is 16.16

6 0

3 years ago