MATHEMATICS HIGH SCHOOL

What is the total surface area of a right circular cylinder with base radius 7cm and height 12cm.

Answers

Answer 1

Answer:

Answer:

Using 3.14 for pi

835.24 cm^2

Using the pi button for pi

835.6636459 cm^2

Step-by-step explanation:

The surface area of a cylinder is given by

SA = 2 pi r^2 + 2 pi r h

= 2 * pi ( 7)^2 + 2 pi ( 7) * 12

= 98 pi + 168 pi

=266 pi

Using 3.14 for pi

835.24 cm^2

Using the pi button for pi

835.6636459 cm^2

Answer 2

Answer:

Answer:

226 $\pi$ or 835.664

Step-by-step explanation:

Surface area of a right cylinder= 2πrh+2πr^2

=2π7✖️12+2π49

=226π

Hope this helped, and have a nice rest of your day!

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James has a job with a current salary of $42,000. He wants to earn a college degree that will take him 2 years to complete and it will cost $28,000 per year. He will go to school full time and will not be able to work. Upon graduation, James' new salary will be $56,000 per year. How many years will it take James to recover his investment?

Answers

It will take 2.5 years for James to recover his investment.

Further explanation

Given:

From the above problem, we get these information

- James' current salary is $42000/year

- His college's tuition fee is $ 28000/year

- It takes 2 years to complete his degree

- Salary after finish degree is $ 56000

Question:

How many years will it take James to recover his investment?

James' investment would be his college's tuition fee for 2 years and the salary that he should get while away from work for 2 years.

Those statement can be write down:

investment = 2 years tuition + 2 years salary

$\boxed {investment = (2 *42000)+ (2*28000) }\n\boxed {investment = 84000+56000=140000 }$

so the total investment is $ 140000

After finished study, James salary would be $56000/year, so the investment will recover in

$\boxed {(140000)/(56000) = 2.5 years }$

hence, the investment will recover in 2.5 years.

Learn more

Investment for college brainly.com/question/937642

Comparing investment recover time brainly.com/question/2583931

Keywords: investment, college investment, recover investment, salary, tuition fee

5) Joy and Cullen put some money into their money boxes every week. The amount of money (y), in dollars, in their money boxes after a certain amount of time (x), in weeks, is shown by the equations below: Joy: y = 30x + 20 Cullen: y = 20x + 90 a) After how many weeks will Joy and Cullen have the same amount of money in their money boxes?
b) What is that amount?

Answers

After 7 weeks Joy and Cullen will have the same amount of money in their money boxes and the amount is $230.

What is a linear system of equations?

A system of linear equations consists of two or more equations made up of two or more variables such that all equations in the system are considered simultaneously. The solution to a system of linear equations in two variables is any ordered pair that satisfies each equation independently.

a) The given system of equations are y=30x+20 -----(i) and y=20x+90 -----(ii)

Fromm equation (i) and (ii), we have

30x+20=20x+90

30x-20x=90-20

10x=70

x=7

b) Substitute x=7 in equation (i), we get

y=30×7+20

y=210+20

y=230

Therefore, the solution of the system of equations is (7, 230).

To learn more about the linear system of an equations visit:

brainly.com/question/27664510.

#SPJ3

Answer:

The answer is D trust me i helped my friend Week 7 And the amount is 230$

Step-by-step explanation:

A bouquet of flowers contains 46 flowers and half of them are roses.How many of the flowers are not roses

Answers

Answer:

Step-by-step explanation:

46 divided by 2

equals:23

How would you write 2,405 using a power of ten

Answers

Answer:2405.0

Step-by-step explanation:

Answer:

2405^10=6.4736737e+33

Rewrite the fraction in simplest form.
24/36

Answers

24:2 = 12, 12:2 = 6, 6:3= 2
36:2 = 18, 18:2 = 9, 9:3= 3
So the answer is 2/3
make sure you divide the top and bottom number with the same number :D

the maximum height of a vehicle that can safely pass under a bridge is 12 feet and 5 inches a truck measures 160 inches into height. which best explains whether or not the truck can pass safely under the bridge