MATHEMATICS MIDDLE SCHOOL

After five years of earning interest at an annual rate of 4%, an investment has earned $1,200 in interest. Determine the amount of the initial investment. A full answer would be nice please!

Answers

Answer 1
Answer:

Answer: Using the Interest equation I can do this:

I = P*r*t

1200 = P*0.04*5

To get the answer:

P = 1200/(0.2)

P = 12000/2 = $6000


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COLLEGE

At the community center nine boys and nine girls are playing singles at the community center nine boys and nine girls are playing singles table tennis. If each girl plays against east boys everyone’s how many games are played?

Answers

Answer:

81

Step-by-step explanation:

9girls x 9 boys to play each other


81 games. One girl plays a game with each boy so one girl (1) x nine boys (9)=9. Likewise, one boy (1) x nine girls (9)=9. This sequence can be done with every boy and girl. So nine games for one girl equals 9, since there’s nine girls 9x9=81
HIGH SCHOOL

Last week, Ethan finished 3 1⁄5 books, but this week he only finished 1 4⁄5 books. How many more books did he read last week?

Answers

3 1/5 - 1 4/5 = 1 2/5
you could also convert to a decimal so
3.2-1.8=1.4
and 1.4 in fraction form is 1 2/5
COLLEGE

Mr. Rr the Rreliable Rrobot has been programmed to whistle every 18 seconds and do a jumping jack every 42 seconds, starting from the moment he is turned on. (For example, he does his first jumping jack 42 seconds after he is turned on.) How many times during the first 15 minutes after activation will Mr. Rr whistle and do a jumping jack at the same instant?

Answers

15 mins = 900 s

We need to find all common multiples of 18 and 42 less than or equal 900.
We'll find the least common multiple first.

18|2
9|3
3|3
1

42|2
21|3
7|7



Now, we nned to find all multiples of 126 that are less than or equal 900.
Those are 126,252,378,504,630,756,882. There are 7 of those.
Therefore the answer is 7.

15 minutes = 900 seconds

so basically, we would have to find the common multiples of 18 and 42....going all the way to 900

I am not gonna list all the multiples of 18 and 42.....but the common multiples of both are : 126,252,378,504,630,756,882 ...thats 7 numbers

therefore, he will do jumping jacks and whistle (at the same time )  7 times during the 15 minute period
MIDDLE SCHOOL

Subtract 2x2 - 6x - 4 from 4x2 - 4x + 3.

Answers

Answer:

2x² + 2x + 7

Step-by-step explanation:

It is given that, two expressions

2x² - 6x - 4 and 4x² - 4x + 3

To find the subtraction result

4x² - 4x + 3 - (2x² - 6x - 4 )

 = 4x² - 4x + 3 - 2x² + 6x + 4

 = 4x² - 2x² - 4x + 6x + 3 + 4

 = 2x² + 2x + 7

Therefore the result for subtraction is  2x² + 2x + 7

Answer:

= 2x² + 2x + 7

HIGH SCHOOL

The equation y = 5.78 • 1.15x fits the graph of stock XYZ over the past month with an r-value of .9918. How much do you think XYZ will be worth at x = 22 days? A.$125.11 

B.$15.19 

C.$57.84 

D.$99.18

Answers

The answer is $125.11 (APEX)
Not sure if this is right or not, but I chose 125.11 after I typed in the equation, haven’t used R-value at all. Will comment if correct — APEX
MIDDLE SCHOOL

the perimeter of a rectangle is to be no greater than 90 cm in the length must be 25 cm find the maximum width of the rectangle

Answers

Perimeter form = 2l + 2w

2(25) + 2(w) < or equal 90

50 + 2w = 90

Subtract 50 from both sides

2w = 40

W = 20

Hope this help!
MIDDLE SCHOOL

A large container holds 5 gallons of water. It begins leaking at a constant rate. After 10 minutes, the container has 3 gallons of water left. At what rate is the water leaking?

Answers

Answer would have to be too the gallon of water would have to be2
MIDDLE SCHOOL

Given that ABCD is a rhombus, what is the value of x?
(3x - 26)​

Answers

Answer:its 29

Step-by-step explanation:

Answer:

29

Step-by-step explanation:

MIDDLE SCHOOL

Subtract 386 from 72,000

Answers

The answer is -71614

71614 is the answer, this can be found by simply solving this expression: 72000 - 386

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