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3 years ago

Which representation does not show y as a function of x

Mathematics

1 answer:

chubhunter [2.5K]3 years ago

8 0

J because the x value is used more then once.

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Y varies directly as the square of x. If y is 25 when x is 3 find y when x is 2

Vilka [71]

Answer:

y = $\frac{100}{9}$

Step-by-step explanation:

given y varies as the square of x then the equation relating them is

y = kx² ← k is the constant of variation

to find k use the given condition y = 25 when x = 3

k = $\frac{y}{x^{2} }$ = $\frac{25}{9}$

⇒ y = $\frac{25}{9}$ x²

when x = 2

y = $\frac{25}{9}$ × 4 = $\frac{100}{9}$

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3 years ago

Estimate 73% of 120 Thanks if you help!

xxMikexx [17]

Answer:

73/100 (120)

answer:-87.6

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3 years ago

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K=dF-DF solve for F How do you solve for this??

aleksandrvk [35]

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3 years ago

Mason can walk 4 miles in 1 hour.how many miles can he walk in 3 hours

sdas [7]

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3 0

3 years ago

Please help me!!!!!!!!!!!!!

monitta

Answer: see proof below

Step-by-step explanation:

Use the following Half-Angle Identities: tan (A/2) = (sinA)/(1 + cosA)

cot (A/2) = (sinA)/(1 - cosA)

Use the Pythagorean Identity: cos²A + sin²B = 1

Use Unit Circle to evaluate: cos 45° = sin 45° = $\frac{\sqrt2}{2}$

Proof LHS → RHS

Given: $cot\ (22\frac{1}{2})^o-tan\ (22\frac{1}{2})^o$

Rewrite Fraction: $cot\ (\frac{45}{2})^o-tan\ (\frac{45}{2})^o$

Half-Angle Identity: $\dfrac{sin(45)^o}{1-cos(45)^o}-\dfrac{sin(45)^o}{1+cos(45)^o}$

Substitute: $\dfrac{\frac{\sqrt2}{2}}{1-\frac{\sqrt2}{2}}-\dfrac{\frac{\sqrt2}{2}}{1+\frac{\sqrt2}{2}}$

Simplify: $\dfrac{\frac{\sqrt2}{2}}{\frac{2-\sqrt2}{2}}-\dfrac{\frac{\sqrt2}{2}}{\frac{2+\sqrt2}{2}}$

$=\dfrac{\sqrt2}{2-\sqrt2}-\dfrac{\sqrt2}{2+\sqrt2}$

$=\dfrac{\sqrt2}{2-\sqrt2}\bigg(\dfrac{2+\sqrt2}{2+\sqrt2}\bigg)-\dfrac{\sqrt2}{2+\sqrt2}\bigg(\dfrac{2-\sqrt2}{2-\sqrt2}\bigg)$

$=\dfrac{2\sqrt2+2}{4-2}-\dfrac{2\sqrt2-2}{4-2}$

$=\dfrac{4}{2}$

= 2

LHS = RHS: 2 = 2 $\checkmark$

7 0

4 years ago

Which representation does not show y as a function of x​

Which representation does not show y as a function of x