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3 years ago

Why are these incorrect 3sqrt 7 - sqrt 7 =3

2 answers:

5 0

Because the left side sqrt is multiplied by 3 if it was just added it would be correct because it would cancel out and leave the 3’s. Since it’s multiplied it would change the value

Ivenika [448]3 years ago

4 0

$\bf 3\sqrt{7}-\sqrt{7}=3\implies 3\sqrt{7}-1\sqrt{7}=3\implies \stackrel{\textit{adding like-terms}}{2\sqrt{7}\ne 3}$

bear in mind that 3√7, is really 1√7 + 1√7 + 1√7, if we subtract 1√7 from it, we're left with 2√7.

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What is the surface area of a triangular based pyramid with a slant height of 8 and a base length of 5? Rounded to the nearest h

torisob [31]

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3 0

4 years ago

In which of the following sets can each

Svet_ta [14]

The answer to the question is A

6 0

3 years ago

Click picture. please help

AleksandrR [38]

For this question we have to take LCM of the fractions to simplify it and process further. So, by LaTeX interpreter equation editor, Here we go.

$\mathbf{Least \: Common \: Multiplier: 3x}$

$\mathbf{\dfrac{2}{x} \times 3x + \dfrac{1}{3} \times 3x - \dfrac{4}{x} \times 3x}$

Combine the fractions to multiply the numerator.

$\mathbf{\dfrac{2 \times 3x}{x} + \dfrac{1 \times 3}{3}x = \dfrac{4 \times 3x}{x}}$

$\mathbf{\dfrac{6x}{x} + \dfrac{3}{3}x = \dfrac{12x}{x}}$

$\mathbf{6 + x = 12}$

Just subtract both of the current sides by the numbered value "6".

$\mathbf{6 + x - 6 = 12 - 6}$

$\boxed{\underline{\mathbf{Final \: \: Answer: \: x = 6}}}$

Hope it helps.

8 0

3 years ago

im rlly confused (its yes and no answers)Decide if each pair of expressions is equivalent.6(-4t + 5) and -2(15 - 12t)1/5(20t - 1

kirill [66]

Given data:

The expression of the first option is,

$\begin{gathered} \text{6(-4t+5})and\text{-2(15}-12t) \\ =-6(5-4t) \end{gathered}$

Thus, the above expression are not equivalent.

The expression in the second option is,

$\begin{gathered} \frac{1}{5}(20t-15)\text{ and }4t-3 \\ 4t-3\text{ and 4t-3} \end{gathered}$

Thus, yes they are equivalent.

The expression in the third option is,

$\begin{gathered} 1.5\text{ }-2\text{t and 0}.25(8-6t) \\ 1.5\text{ }-2\text{t and 2-1.5t} \end{gathered}$

Thus, the above expression are not equivalent.

The expression in fourth option is,

$\begin{gathered} -3(t-7+5t+8)\text{ and }-18t-3 \\ -3(6t+1)\text{ and -18t-3} \\ -18t-3\text{ and -18t-3} \end{gathered}$

Thus, yes the above expression is equivalent.

3 0

2 years ago

If the Alexanders completed the 735 mile trip in 15 hours, what was their average rate of travel?

Darina [25.2K]

The rate of travel here is in mph - "miles per hour".

That just means how many miles you can travel in one hour. In this problem, you're given 15 hours, and the distance they travel within those 15 hours.

Therefore, you should divide both the number of miles and the number of hours by 15 to find out how far they can travel in 1 hour.

735 ÷ 15 = 49 miles
15 ÷ 15 = 1 hour

Their average rate of travel was 49 miles in 1 hour, which is 49 mph.

6 0

4 years ago

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