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3 years ago

Write a word problem with x+2.5=127.5

2 answers:

8 0

During babysitting, she gained a total of x amount of money. Afterwards, she went to the park to sell some lemonade and gained a total of $2.5. She ended up with a total of $127.5 at the end of the day. How much money did she have before she sold lemonade?

notsponge [240]3 years ago

6 0

Answer:

Daniel saved $127.50 for a guitar. His younger brother took $2.50 from him. How much money does he have left (x)? Solve for x.

Step-by-step explanation:

hope that helped :)

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Likurg_2 [28]

<h3>Answers:</h3>

6. -1

7. 1

8. 11

9. -30

10. 0

11. 16

12. -8

13. -28

14. -65

15. -98

16. -100

17. 33

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4 0

3 years ago

Read 2 more answers

(5a-2)(5a+2)-3(1-a)-3a=

attashe74 [19]

So first we need to know the order of operations
P - Parenthesis
E - Exponents
M - Multiplication
D - Division
A - Addition
S - Subtraction

Then the special cases:
(I have attached a picture below)

Lets get into action!
(5a - 2)(5a + 2) - 3( 1 - a ) - 3a
25a² - 4 - 3 + 3a - 3a
25a² - 7
25a² - 7 is the answer

8 0

3 years ago

Read 2 more answers

During an experiment, Mrs. Melsoner uses an analytical scale to measure the mass of a substance. The analytical scale says she h

stich3 [128]

Answer:

hii there

The correct answer is ( D )

hope it helps you

have a nice day

7 0

3 years ago

The mean of eight numbers is 40 and the mean of other twelve different numbers is 30. What is the mean of all the twenty numbers

lana [24]

Answer: 34

================================================

Work Shown:

S = sum of the first 8 numbers

S/8 = 40 is the mean of those first 8 numbers

S = 8*40

S = 320 so the first 8 numbers add to this value

-------

R = sum of the 12 remaining values

R/12 = 30

R = 12*30

R = 360 is what the other 12 values add to

-------

R+S = 360+320 = 680 is what all twenty values add to. Divide this by 20 to get the overall average

(R+S)/20 = 680/20 = 34

5 0

3 years ago

Find the numbers b such that the average value of f(x) = 4 + 10x − 6x2 on the interval [0, b] is equal to 5.

Tju [1.3M]

Answer:

b = (5±√17)/4 ≈ {0.2192, 2.2808}

Step-by-step explanation:

The average on the interval is found from the integral ...

$\frac{1}{b}\int\limits^b_0 {(4+10x-6x^2)} \, dx =\frac{1}{b}(4b+5b^2-2b^3)\\\\=-2b^2+5b+4$

We want the value of this integral to be 5, so we want to find b such that ...

5 = -2b^2 +5b +4

2b^2 -5b +1 = 0

b^2 -5/2b = -1/2

b^2 -5/2b +25/16 = -1/2 +25/16

(b -5/4)^2 = 17/16

b = (5±√17)/4

The average value of f(x) is 5 on the intervals ...

[0, (5-√17)/4] and [0, (5+√17)/4]

6 0

3 years ago