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3 years ago

Solve the following equation with rational coefficients

Mathematics

2 answers:

umka21 [38]3 years ago

5 0

Answer:

I think its x=48

Step-by-step explanation:

photoshop1234 [79]3 years ago

4 0

Answer:

X = 7.5

Step-by-step explanation:

0.8x = 6

x = 6/0.8

x = 7.5

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A millimeter is 0.001 of a meter how many millimeters are there in 7 meters

yawa3891 [41]

$\frac{1000 \, mm}{1 \, m} \cdot \frac{7}{7} = \frac{7000 \, mm}{7 \, m}$

Therefore, there are $7000$ millimeters in seven meters.

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3 years ago

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Please help :) Find the unknown length y in the following pair of similar triangles. y= ?

Nimfa-mama [501]

Answer:

Y should equal to 4.5

Step-by-step explanation:

Since they are similar triangles and each of the measurements on the second triangle are divided by two you would do the same for y

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Veseljchak [2.6K]

Answer:

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Step-by-step explanation:

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astraxan [27]

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Step-by-step explanation:

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3 years ago

1+secA/sec A = sin^2 A / 1-cos A

Fofino [41]

Answer: see proof below

<u>Step-by-step explanation:</u>

$\dfrac{1+\sec A}{\sec A}=\dfrac{\sin^2 A}{1-\cos A}$

Use the following Identities:

sec Ф = 1/cos Ф

cos² Ф + sin² Ф = 1

<u>Proof LHS → RHS</u>

$\text{LHS:}\qquad \qquad \dfrac{1+\sec A}{\sec A}$

$\text{Identity:}\qquad \qquad \dfrac{1+\frac{1}{\cos A}}{\frac{1}{\cos A}}$

$\text{Simplify:}\qquad \qquad \dfrac{\frac{\cos A+1}{\cos A}}{\frac{1}{\cos A}}\\\\\\.\qquad \qquad \qquad =\dfrac{1+\cos A}{1}$

$\text{Multiply:}\qquad \qquad \dfrac{1+\cos A}{1}\cdot \bigg(\dfrac{1-\cos A}{1-\cos A}\bigg)\\\\\\.\qquad \qquad \qquad =\dfrac{1-\cos^2 A}{1-\cos A}$

$\text{Identity:}\qquad \qquad \dfrac{\sin^2 A}{1-\cos A}$

$\text{LHS = RHS:}\quad \dfrac{\sin^2 A}{1-\cos A}=\dfrac{\sin^2 A}{1-\cos A}\quad \checkmark$

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3 years ago