2is added to twice a certain number and the sum is doubled .the result is 10 less than 5 times the original number

14

Step-by-step explanation:

2(2n + 2)= 5n - 10

4n + 4 = 5n - 10

n=14

2 is added to twice a certain number and the sum is doubled. The original number is 14

Solution:

Let x be the original number

Given that the 2 is added to twice of x. This can be represented as (2 + 2x)

Now it is given that the sum is doubled which means 2(2 + 2x)

The result is 10 less than 5 times the original number "x" which means 2(2 + 2x) = 5x - 10

The above expression is solved to get the value of original number

2(2 + 2x) = 5x - 10

4 + 4x = 5x - 10

On rewriting the above expression, we get

5x - 10 -4 -4x = 0

x - 14 = 0

x = 14

Hence the original number is 14

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.