Answer:
Step-by-step explanation:
f(x)=4/5x^2+12x
For f(5)
: f(x) = 4/5(5)2 + 12(5)
= 4/5 × 25 + 60
= (4×5) + 60
= 20 + 60
= 80
Answer:
367.2 cm²
Step-by-step explanation:
First, you need to find the area of the lateral surfaces, since each one is a 5cm by 6cm rectangle, all you need to do is multiply to find the area of one of them, and then multiply by 6 to find the area of all 6 sides.
lateral area = 5cm * 6cm * 6
lateral area = 30cm² * 6
lateral area = 180 cm²
Next, you need to find the total surface area by multiplying the area of the base by two and adding that to the lateral surface area.
SA = 180cm² + 2(93.6cm²)
SA = 180cm² + 187.2cm²
SA = 367.2cm²
The total surface area is 367.2 cm².
Make sure D is by its self so
90=6(d-84)
Divide both sides by 6 to get rid of 6 from the right side so
90/6= (d-84)
15 =(d-84)
Now get rid of the 84 by adding it
15+84= d
99=d therefore d is equal to 99
Ok...don't have the statements, but the equations would be:
y=20+10X
y=50+5X
They would be equal in cost at X=6... For more than 6 days, the gym would be cheaper. For less than 6, the classes would be cheaper.