First, create an equation with the criteria given.
If we let x be your number,

(

is twice the product of 3 and x, and if it exceeds

by 10, then we add 10 to

to make the two sides of the equation equal.)
Now, solve for

.
Answer: 30 feet
Step-by-step explanation:
10 / 2.5 = 4
7.5 * 4 = 30
Answer:

And that represent the instantaneous velocity at a given time t.
And then we just need to replace t =2 in order to find the instantaneous velocity and we got:

Step-by-step explanation:
For this case we have the position function s(t) given by:

And we can calculate the instanteneous velocity with the first derivate respect to the time, like this:

And if we take the derivate we got:

And that represent the instantaneous velocity at a given time t.
And then we just need to replace t =2 in order to find the instantaneous velocity and we got:

Answer:
∠E = 40°
Explanation:
The sum of interior angles in any polygon can be calculated using the following rule:
sum of interior angles = (n-2)*180
where n is the number of sides.
Now, a quadrilateral has 4 sides, this means that:
sum of interior angles = (4-2)*180 = 360°
Based on the above:
∠C + ∠D + ∠E + ∠F = 180
We are given that:
∠C = 60°
∠D = ∠E = ∠F
Therefore:
60 + 3*∠E = 180
3 * ∠E = 120°
∠E = 120/3 = 40°
Hope this helps :)