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3 years ago

10. What is the value of ? A. 47.5° B, 85° 95° C. 95° С D. 132.59

Mathematics

1 answer:

leonid [27]3 years ago

5 0

Answer:

the value of thita = 95°

C. 95°

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4.5*10^-8/9*10^-9 find the quotient and write it in scientific form

g100num [7]

Answer:

Step-by-step explanation:

4.5*10^-8/ 9*10^-9

1) Reduce the fraction, express 9 as a product of multiplying 4.5*2

4.5*10^-8/4.5*2*10^-9

2) Then notice the common factor of numerator and denominator( 4.5) , get rid of it in both numerator and dnominator

3) 10^-8/ 2*10^-9= 1/2*(10^-8/10^-9)= 0.5* (10^-8/10^-9)

10^-8/10^-9= 10^(-8-(-9))= 10^1=10.

so 0.5*10=5 (it is the answer written in scientific form)

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3 years ago

Simplify the following expression 7a + 5b - 2a + b

Papessa [141]

5a+6b would be the simplified answer

7 0

2 years ago

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Please help me :(

damaskus [11]

You could use sine to find it
sin45 = 8/m
m = 8/sin45

3 0

3 years ago

A plane flew 720 mi with a steady 30 mi/h tailwind. The pilot then returned to the starting point, flying against that same wind

NNADVOKAT [17]

Answer:

Plane's speed is 150 miles/hour

Step-by-step explanation:

Let the plane's airspeed be x

Speed of wind is 30 miles/hour

When a plane flew with the wind , Speed = (x+30)

So, the speed plain with wind on going = (x+30)

Since we are given that on returning plane fly against the wind .

So,When a plane flew against the wind , Speed = (x-30)

So, the speed plain against wind on returning = (x-30)

Distance = 720 miles .

$Time = \frac{Distance}{Speed}$

So, time on going $=\frac{720}{(x+30)}$

Time on returning $=\frac{720}{(x-30)}$

Now we are given that the total time for the whole trip (going + returning) = 10 hours.

So, $\frac{720}{(x+30)}+\frac{720}{(x-30)}=10$

$\frac{720x-21600+720x+21600}{(x+30)(x-30)}=10$

$720x-21600+720x+21600=10(x+30)(x-30)$

$720x+720x=10(x+30)(x-30)$

$1440x=10(x^2 -[30]^2)$

$144x=x^2 -900$

$x^2-144x -900=0$

$x^2-150x+6x -900=0$

$x(x-150)+6(x -150)=0$

$(x-150)(x+6)=0$

$x= 150,x= -6$

So, the plane's speed is 150 miles/hour

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3 years ago

What is the number of degrees in an angle whose radian measure is 11pie/12?

Diano4ka-milaya [45]

11pi/12

Note:

2pi = 360°

(11pi/12)(360°/2pi)
330°

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3 years ago

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10. What is the value of ? A. 47.5° B, 85° 95° C. 95° С D. 132.59​

10. What is the value of ? A. 47.5° B, 85° 95° C. 95° С D. 132.59