Answer:
f(3) = 11
Step-by-step explanation:
To evaluate f(3), substitute x = 3 into f(x), that is
f(3) = 2(3) + 5 = 6 + 5 = 11
Irrational numbers can not be precisely represented in decimal form because they are non-terminating, non-repeating decimals. Also they cannot be written as a fraction as well.
The equation for resolving couples will come in place

Using the unit vectors by i and j along the x-axis and the y-axis you'll express it as a Cartesian vector.
<h3>
Couple moment and Cartesian vector</h3>
Couple moment:This looks at the product of the forces acting on a body( in this context a steering wheel ) by the perpendicular distance that exist amidst the forces.
Cartesian vector:this is the representation of unit vectors by i and j along the x-axis and the y-axis, respectively.
Therefore, in calculating the <em>couple</em> moment t acting on the steering wheel, the equation for resolving couples will come in place

Using the unit vectors by i and j along the x-axis and the y-axis you'll express it as a Cartesian vector.
More on Cartesian Co-ordinate
brainly.com/question/4511664
Use the Pythagorean theorem:
Let x = the height.
2^2 + x^2 = 7.5^2
Simplify:
4 + x^2 = 56.25
Subtract 4 from both sides:
x^2 = 52.25
Take the square root of both sides:
x = 7.2284 m Round the answer as needed.