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Answer

7. 30

8. 54

Step-by-step explanation:

For 7 do 2x+3x=90 because it is a right angle

then solve for x and get 15

to get the angle you are looking for multiply 2 by 15

and get the answer 30

For 8 to find the value of x you would need to...

add (4x+6) + (11x-6)= 180 because 180 is a straight angle.

Then simply solve for x and get 15x=180 which equals 12

The to get the angle you plug it in to (4x+6) and get the answer 54

his chances of getting a coin of higher value is 4/19

step-by-step explanation:

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.