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Elena L [17]
4 years ago
8

23/40 - 11/30 Please answer

Mathematics
2 answers:
kobusy [5.1K]4 years ago
4 0

23/40 - (11)/30
Put 23/40 - 11/30 over the common denominator 120. 23/40 - 11/30 = (3×23)/120 + (4 (-11))/120:
(3×23)/120 + (4 (-11))/120
3×23 = 69:
69/120 + (4 (-11))/120
4 (-11) = -44:
69/120 + (-44)/120
69/120 - (44)/120 = (69 - 44)/120:
(69 - 44)/120
 | 6 | 9
- | 4 | 4
 | 2 | 5:
25/120

The gcd of 25 and 120 is 5, so 25/120 = (5×5)/(5×24) = 5/5×5/24 = 5/24:
Answer: 5/24
iVinArrow [24]4 years ago
3 0
The answer to this question is 5/24
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Which can be used to solved the expression (r^-4)^3
Oksana_A [137]

Answer:

The expression is equal to 1 over 12 factors of r

Multiplying the exponents will create an equivalent expression.

Step-by-step explanation:

We are given the following in the question:

(r^-^4)^3

<h3>Properties of exponent: </h3>

(x^m)^n=x^m^n

x^-^a=\frac{1}{x^a}

Thus, we can simplify the given expression as:

(r^-^4)^3

= r^-^1^2

= \frac{1}{r^1^2}

Thus, the correct answer is:

Option 2) The expression is equal to 1 over 12 factors of r

Option 4) Multiplying the exponents will create an equivalent expression.

3 0
3 years ago
!!MATH GENIUSES HELP ME!!
seraphim [82]

Answer:

D

Step-by-step explanation:

Let x be Bill’s scores.

Let y be Theo’s scores.

x + y = 90

x² = y

Solve for x in the second equation.

x = √y

Put x as √y in the first equation and solve for y.

√y + y = 90

√y = 90 - y

y = (90 - y)²

y = - y² - 180y - 8100

0 = -y² - 181y - 8100

0 = (-y+81)(y-100)

-y+81=0

y = 81

y - 100 = 0

y = 100

100 does not work if we plug in to check, so y is 81.

y = 81

Put y as 81 in the first equation and solve for x.

x + 81 = 90

x = 9

Bill scored 9 goals and Theo scored 81.

8 0
3 years ago
6. Mrs. Sam buys pencils for $15 per one hundred packs.
Alexxx [7]

Answer:

a.) her loss is 5 dollars

b.) her profit is 10 dollars

c.) she should sell them for $0.15

4 0
3 years ago
It’s just 2.a answer please
Inessa05 [86]
You have to convert the 30 inches into you know what and add them all together
8 0
3 years ago
53/7 as a mixed number
marysya [2.9K]
Its already an improper fraction.
If you mean mixed number it would be 7 4/7.
Hope this helps!:)
7 0
3 years ago
Read 2 more answers
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