Answer:
6m^10?
Step-by-step explanation:
To start, the question is asking for surface area of a cylinder, meaning you will have to use this formula to find it: A=2πrh+2πr^2.
Since you already know that the diameter of the plastic cylinder is 4 marbles long, and each marble is 2 cm in diameter, you would multiply 4 and 2 to get that your diameter is 8 cm. However, since the surface area of a cylinder formula uses radius, you would simply divide 8 by 2 to get that the radius of the cylinder is 4 cm.
Now, since you already know that the height of the cylinder is equal to 10 marbles, multiply the amount of marbles by 2 to get that the height of the cylinder is 20 cm.
Now that you know the height and the diameter of the cylinder, plug the values into the formula: A=2π(4)(20)+2π(4)^2.
Assuming that pi is 3.14, simplify the equation as according to PEMDAS and you get that the area of plastic needed to make one cylinder is 602.88 cm squared
Cheryl has to pay a total charge of £100.98.
Step-by-step explanation:
Step 1; A ticket for an adult costs £12 and a ticket for a child costs £6. So for 6 adults and 3 children, the ticket price is
Ticket price= 6 × £12 + 3 × £6 = £72 + £18 = £90.
So the ticket prices alone are £90. A booking fee of 10% is added to this £90.
Booking fee = 10% of £90 = £9.
Ticket price inclusive of booking fee = £90 + £9 = £99.
Step 2; Cheryl pays by credit card so an additional 2% is added to the final price i.e. 2% is added to the £99.
Credit card charges = 2% × £99 = £1.98
Final booking fee = £99 + £1.98 = £100.98.
So buying the tickets with credit card, Cheryl pays £100.98 to buy the tickets.
Answer:
Step-by-step explanation:
A salt solution contains 10% salt and weights 80g.
<u>Salt content of the solution is:</u>
<u>4% solution has 8 g salt, total solution is:</u>
- 0.04x = 8
- x = 8/0.04 = 200 g
<u>Water to be added:</u>
145% of what number is 870 is 870/1.45=600
Answer=600
