Help ASAP please!!!!!

Mathematics

2 answers:

Ganezh [65]3 years ago

6 0

Divide the diameter by 2 to get the radius and use the formular pi r^2.
13.5/2=6.75
3.14*6.75^2
3.14*45.6=143.07
B is the answer

Simora [160]3 years ago

4 0

.........143,07cm..........

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A number is first decreased by 40% and then again decreased by 60%. Find the percentage increase or decrease in the whole sum...

dangina [55]

Answer:

It is decreased by 76 percent.

Step-by-step explanation:

The key skills are percentage and multiplication with percentages.

You first have to get a variable. Let's use the letter o as a variable (o For orginial cost).
Then we have to find out how much it is when o is decreased by 40 percent. 100% (or the whole) - 40% is 60%. Therefore, with a 40 percent decrease, It would be 60% of o, or 0.6o.
Then, if it decreases by 60 percent, the final number would be 100% - 60 % or 40% of 0.6o. This means itbwould be 0.4 × 0.6o which is 0.24o
0.24o means that o is 24 percent of its orginial number, which is 100% - 24% or a 76 percent decrease.

Hope you understood and have a nice day!

5 0

3 years ago

PLEASE HELP!! Jackson relies on his customers to tell their friends about his business. His business grows as each customer cont

Andrew [12]

Answer:

a) y = 9.187 * 1.09899^x

b) 2647.2695

Step-by-step explanation:

a) using calculator, (mine is ti84 plus ce), we use stat and edit. we plug in x and y. x will be in the L1 and y wil be in L2. Now, we go to stat, calc, and we press ExpReg, short for exponential regression. we calculate and get y = 9.187 * 1.09899^x

you can round if you want. well, i guess you shouldn't, cuz it changes it dramatically

b) Now, we use y = 9.187 * 1.09899^x into the y= and we put it in whatever slot we want. Now, we press trace. we press 60 to find the y,because the number is always x. the number , y, we want is 2647.2695 recommendations.

4 0

4 years ago

Nine and one-half less than four and one-half times a number is greater than 62. 5. Which of the following represents the soluti

olga2289 [7]

Solution set for a statement is a set of values which satisfy the given statement. The solution set for given condition is: (16, positive infinity)

<h3>How to find the solution set for a given problem?</h3>

Solution set is the set of values of unknown variable for which the given mathematical statement holds true.

<h3>How to form mathematical expression from the given description?</h3>

You can represent the unknown amounts by the use of variables. Follow whatever the description is and convert it one by one mathematically. For example if it is asked to increase some item by 4 , then you can add 4 in that item to increase it by 4. If something is for example, doubled, then you can multiply that thing by 2 and so on methods can be used to convert description to mathematical expressions.

For the given case, the mathematical statement given is

$4\dfrac{1}{2} \times x - 9\dfrac{1}{2} > 62.5$

(where that unknown number was assumed to be 'x', and we used "less than" phrase as subtraction and 'greater than' as >)

Converting mixed fractions to normal fractions, we get the statement as:

$\dfrac{9}{2}x - \dfrac{19}{2} > 62.5\\\\\text{Adding 9.5 on both sides(as 19/2 = 9.5)}\\\\\dfrac{9}{2}x > 62.5 + 9.5\\\\\text{Dividing both sides by 4.5 (as 9/2 = 4.5 and we want to isolate x on one side}\\\\x > 16$