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MA_775_DIABLO [31]
3 years ago
5

At the beginning of spring, Arianna planted a small sunflower in her backyard. When

Mathematics
1 answer:
zhannawk [14.2K]3 years ago
6 0

Answer:

3 weeks: 21.5 inches

w weeks: 20+0.5w inches

Step-by-step explanation:

Equation: 20+0.5w.

20 was when it was first planted and 0.5 is the amount it grows per week.

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Eighth grade &gt;<br>V.13 Multiply using the distribu<br>Simplify the expression:<br>3(3 + 4y)​
Oksanka [162]

Answer:

9+12y

Step-by-step explanation:

3x3+3x4y

3 0
4 years ago
this is an easy question so whoever is the first one who gets all of them I will make you the brainlist queen or King ​
DochEvi [55]

Answer:

1. 3.87

2. 7.07

3. 69.89

4. 70.87

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
If
baherus [9]

Answer:  see proof below

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

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
Use the commutative property of multiplication to rewrite 10 • 5 • 12. Which expression is equivalent?A.10 • 5 • (5 + 5)B.10 + 5
guapka [62]

Answer: D

Step-by-step explanation:

8 0
3 years ago
Write a decimal that is 1/10 of 0.9
ki77a [65]
The correct answer is 0.09
3 0
4 years ago
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