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VLD [36.1K]
3 years ago
7

13) (-2. – 5v).- (-4v – 2) Can you help a girl out

Mathematics
1 answer:
irga5000 [103]3 years ago
8 0

Answer:

If simplifed, it'll be -v

Step-by-step explanation:

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What is the square root of 85 and divide that by PI (3.14)​
stira [4]

√85 = 9.219544457

9.219544457 / π = 2.93467214

Round the answer as needed.

4 0
2 years ago
Help pls!
storchak [24]
The answer is a: t+11
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3 years ago
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A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the
Arturiano [62]

Answer:

the coefficients of static friction is 0.577

the coefficients of fkinetic friction is 0.54

Step-by-step explanation:

given information

θ = 30°

S = 2.5 m

t = 4 s

- Static friction

F - F(friction) = 0

W sin θ = μs W cos θ  

μs = sin θ/ cosθ

   = tan θ

   = tan 30°

   = 0.577

- kinetic friction

S = v_{0} t + \frac{1}{2} at^{2}

v_{0} t = 0

S = \frac{1}{2} at^{2}

a = \frac{2S}{T^{2} } = \frac{2 x 2.5}{4^{2} }

  = 0.3 m/s^{2}

F - F(friction) = m a

W sin θ - μ W cos θ  = m a

mg sin θ - μk mg cos θ  = m a

g sin θ - μk g cos θ  = a

μk = g sin θ  - a / g cos θ

    = 9.8 sin 30° - 0.3 / 9.8 cos 30°

    = 0.54

7 0
3 years ago
there are 76 students in chorus. the number of girls in the chorus is 12 more than triple the number of boys.
lora16 [44]
Girls= 12+3b
boys=b

boys+girls=76

12+3b+b=76;
12+4b=76
-12 -12
4b=64
÷4. ÷4

b=16

I hopes this help!
4 0
3 years ago
Micah takes a job with a starting salary of 78,000 for the first year
ycow [4]
$78,000 for his first year of working
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2 years ago
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