<span>Dogs are the most popular type of pet among teenagers in the town.
</span>
Answer:
2.05hrs
Step-by-step explanation:
Given he total cost c(x) of hiring a dump truck and an operator is described by the function c(x)=300+31x-3.90x^2 , where x is the number of hours worked. If c(x)=$220, then;
220 = 300+31x-3.90x^2
300+31x-3.90x^2 - 220 = 0
3.90x^2 + 31x - 80 = 0
x = -31±√31²-4(-80)(3.9)/2(3.9)
x = -31±√961+1.248/7.8
x = -31±47/7.8
x = -31+47/7.8
x = 16/7.8
x = 2.05
hence the number of working hours is 2.05hrs
Answer:
4710in^2
Step-by-step explanation:
Formula for surface area of a cylinder:
r is the radius
h is the height
In the given cylinder, the height is 35 in, and the radius is 15cm.
The cylinder's surface area is 4710in^2.
Answer:
Step-by-step explanation:
see the attached figure to better understand the problem
we know that
<em>In the right triangle ABC</em>
-----> by a 45°-90°-45° triangle
so
substitute the values
<em>In the right triangle BCD</em>
substitute the values