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2 years ago

What mistake did this student make?

Mathematics

2 answers:

Vilka [71]2 years ago

6 0

The answer is 3) the 1st equation should have been multiplied by 2

Gnoma [55]2 years ago

5 0

Answer:

3. the 1st equation should have been multiplied by 3

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Solve the equation. x² =96 A 4/6 B 16/6 C 9 D 9,-9

alexgriva [62]

Answer:

x = ± 4 $\sqrt{6}$

Step-by-step explanation:

Given

x² = 96 ( take the square root of both sides )

x = ± $\sqrt{96}$ = ± $\sqrt{16(6)}$ = $\sqrt{16}$ × $\sqrt{6}$ = ± 4 $\sqrt{6}$

3 0

3 years ago

As a first step in solving the system shown, Yumiko multiplies both sides of the equation 2x – 3y = 12 by 6. By what factor shou

GenaCL600 [577]

Answer:

Yumiko should multiply the other equation by 3.

If she adds the two equations she would be left with the variable 'x'.

Step-by-step explanation:

Given the two equations are as follows:

$2x - 3y = 12 \hspace{5mm} \hdots (1)$

$5x + 6y = 18 \hspace{5mm} \hdots (2)$

It is given that she multiplies the first equation by 6. Therefore, (1) becomes

$12x - 18y = 72 \hspace{15mm} \hdots (a)$

Now, note that the sign of the variable 'y' is negative. So, if we make the co-effecient of 'y' equal in both the cases, add them it would result in the elimination of the variable 'y'.

The co-effecient of y in Equation (2) is 6. To make it 18 like it is in Equation (1), we multiply throughout by 3.

Therefore, Equation (2) becomes:

$15x + 18y = 54 \hspace{5mm} \hdots (b)$

Now, we add Equation (a) and Equation (b).

$\implies 12x - 18y + 15x + 18y = 72 + 54$

$\implies 27x = 126$

Factor: 3

Equation: 27x = 126

7 0

2 years ago

A chettah can run 2 2/5 kilometers in 1 1/2 mintues at top speed. What id the top speed of a cheetah in kilometers per hour ?

Snezhnost [94]

Answer:

70 miles per hour and 96 kilometers per hour

Cheetahs can go from 0 to 60 miles per hour in just 3.4 seconds and reach a top speed of 70 miles per hour. While they are the fastest land animal in the world, they can only maintain their speed for only 20 to 30 seconds.

Step-by-step explanation:

Please tell me if its wrong then ill change it ^-^ if i can find the right answer fir you!

but if it is right i hope it helps!

4 0

2 years ago

Solve the following radical: 5√13 - 9√13

tankabanditka [31]

Answer is -12 hope I helped.

7 0

2 years ago

100^a x 1000^b can be written in the form 10^w show that w = 2a + 3b

Vesna [10]

$\text{Use}\ (a^n)^m=a^{n+m}\ \text{and}\ a^n\cdot a^m=a^{n+m}.\\\\100^a=(10^2)^a=10^{2a}\\\\1000^b=(10^3)^b=10^{3b}\\\\100^a\cdot1000^b=10^{2a}\cdot10^{3b}=\boxed{10^{2a+3b}}$

7 0

3 years ago