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lora16 [44]
3 years ago
14

Help please!! i have 54:40 left!

Mathematics
2 answers:
Svetach [21]3 years ago
6 0

Answer:

6-2/2+5=4/7

The answer is 4/7 (option A)

DanielleElmas [232]3 years ago
5 0

Answer:

4/7 (first one)

Step-by-step explanation:

6-(2)/(2)+5=4/7

hope this helps

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In a certain library the first shelf is 15.0 cm off the ground, and the remaining four shelves are each spaced 38.0 cm above the
baherus [9]

Answer:

1747.9 J

Step-by-step explanation:

The work done to lift a book by a certain height \Delta h is

W=mg\Delta h

where

m = 1.40 kg is the mass of one book

g=9.8 m/s^2 is the acceleration due to gravity

The first shelf is 15.0 cm (0.15 m) from the ground, and it can be filled with 28 books. So, the work done to fill the first shelf is

W_1=28mg\Delta h=28(1.40)(9.8)(0.15)=57.6 J

The 2nd shelf is 38.0 cm above the first one, so its height from the ground is

\Delta h =15.0+38.0 =53.0 cm=0.53 m

It can also contain 28 books, so the work done to fill this shelf is

W_2=28 mg\Delta h=28(1.40)(9.8)(0.53)=203.6 J

The height of the third shelf is

\Delta h =15.0+38.0 +38.0=91.0 cm=0.91 m

It can also contain 28 books, so the work done to fill this shelf is

W_3=28 mg\Delta h=28(1.40)(9.8)(0.91)=349.6 J

The height of the 4th shelf is

\Delta h =15.0+38.0 +38.0+38.0=129.0 cm=1.29 m

It can also contain 28 books, so the work done to fill this shelf is

W_4=28 mg\Delta h=28(1.40)(9.8)(1.29)=495.6 J

The height of the 5th shelf is

\Delta h =15.0+38.0 +38.0+38.0+38.0=167.0 cm=1.67 m

It can also contain 28 books, so the work done to fill this shelf is

W_5=28 mg\Delta h=28(1.40)(9.8)(1.67)=641.5 J

Therefore, the total work done is:

W=W_1+W_2+W_3+W_4+W_5=57.6+203.6+349.6+495.6+641.5=1747.9 J

6 0
3 years ago
Whats 2 +2 first one to answer I might give brainiest
labwork [276]

Answer:

2 + 2 = 4

OR

2 + 2 = 22

Step-by-step explanation:

Heh

4 0
2 years ago
Read 2 more answers
Which of the algebraic expressions are not linear expressions? Select all that apply. a. 3x - 2 b. -9y c. -7x^2^ + 4x d. -1/2x^2
Sedaia [141]

Answer:

c, d and e

Step-by-step explanation:

A linear expression is an expression in which sum of exponents of variables is at most 1 in each of its terms.

Option a: 3x - 2

Here, the exponent of the variable is 1.

So, it is a linear expression.

Option b: -9y

Here, the exponent of the variable is 1.

So, it is a linear expression.

Option c: -7x^2 + 4x

Here, the highest exponent of the variable is 2.

So, it is NOT a linear expression.

Option d: -\frac{1}{2} x^2

Here, the exponent of the variable is 2.

So, it is NOT a linear expression.

Option e: 8xy

Here, sum of exponents of variables is 2.

So, it is NOT a linear expression.

Hence, c, d and e are NOT algebraic expressions.

6 0
3 years ago
Pablo wants to get a grade of at least 95 in math this semesterSo far he has test scores of 89 98, 97 and 92. He will take his l
Alex Ar [27]

Answer:

the answer is 97 if you're rounding but 99 if you want exactly 95

Step-by-step explanation:

if you add all the previous grades up it'll add up to 376 and then when you add 97 and then divide it by 5 (the total amount of assignments) it'll add up to 94.6 which rounds up to a 95 unless you want it a 95 exactly which would probably be 99

3 0
3 years ago
Read 2 more answers
100 POINTS!! Use the relationship between the angles in the figure to answer the question.
katrin2010 [14]

C.x+49+28=180. Explanation:the top angle and the bottom angles are same so........ 49+28=77. 180-77=103°

6 0
3 years ago
Read 2 more answers
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