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3 years ago

Solve for y. 16 = y/5 + 15

Mathematics

1 answer:

Contact [7]3 years ago

7 0

Answer:

Y = 1 essssssszzzzzzssy

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Find an expression equivalent to 4x – 4 – 2x + 3. 2x – 1 6x – 1 2x – 7 –2x + 3

BigorU [14]

6x-1 because you combine like terms 4x+2x=6x and then -4+3=-1

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3 years ago

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Solve the one step equation: -5a = -50

Margaret [11]

Answer:

a = 10

Step-by-step explanation:

a = 10

Divide -5 on both sides

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The sum of two numbers is 33 and thier difference is 2 find the number

sammy [17]

Answer:

17.5 + 15.5

Step-by-step explanation:

17+ 15 = 32

.5 + .5 = 1

32 + 1 = 33

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3 years ago

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What is the negative reciprocal of -0.3

Mazyrski [523]

Answer:

3.33333333333

Step-by-step explanation:

flip the number

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3 years ago

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baherus [9]

Answer: see proof below

Step-by-step explanation:

Given: cos 330 = $\frac{\sqrt3}{2}$

Use the Double-Angle Identity: cos 2A = 2 cos² A - 1

$\text{Scratchwork:}\quad \bigg(\dfrac{\sqrt3 + 2}{2\sqrt2}\bigg)^2 = \dfrac{2\sqrt3 + 4}{8}$

Proof LHS → RHS:

LHS cos 165

Double-Angle: cos (2 · 165) = 2 cos² 165 - 1

⇒ cos 330 = 2 cos² 165 - 1

⇒ 2 cos² 165 = cos 330 + 1

Given: $2 \cos^2 165 = \dfrac{\sqrt3}{2} + 1$

$\rightarrow 2 \cos^2 165 = \dfrac{\sqrt3}{2} + \dfrac{2}{2}$

Divide by 2: $\cos^2 165 = \dfrac{\sqrt3+2}{4}$

$\rightarrow \cos^2 165 = \bigg(\dfrac{2}{2}\bigg)\dfrac{\sqrt3+2}{4}$

$\rightarrow \cos^2 165 = \dfrac{2\sqrt3+4}{8}$

Square root: $\sqrt{\cos^2 165} = \sqrt{\dfrac{4+2\sqrt3}{8}}$

Scratchwork: $\cos^2 165 = \bigg(\dfrac{\sqrt3+1}{2\sqrt2}\bigg)^2$

$\rightarrow \cos 165 = \pm \dfrac{\sqrt3+1}{2\sqrt2}$

Since cos 165 is in the 2nd Quadrant, the sign is NEGATIVE

$\rightarrow \cos 165 = - \dfrac{\sqrt3+1}{2\sqrt2}$

LHS = RHS $\checkmark$

4 0

4 years ago