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3 years ago

Which comparison is correct? A. 2/10>3/5 B. 2/4>4/8 C. 2/3<10/12 D. 9/12<3/6

Mathematics

1 answer:

Orlov [11]3 years ago

3 0

Answer: D

Step-by-step explanation:

I think it’s D

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Solve by substitution 3x - 5y = -1 , x-y = -1

nevsk [136]

Answer:

(-2, -1)

Step-by-step explanation:

first you must reorganize the equations so that one of them has x or y equaling to something

x - y = -1 --> x = y - 1

then substitute that in for x

3(y - 1) - 5y = -1

and solve for y

3y - 3 - 5y = -1

-2y = 2

y is -1

then plug it back in to an equation to find x

x + 1 = -1

x is -2

6 0

3 years ago

The range of which function includes -4?

Inessa [10]

Start with the last two choices.
You have x + 5 and x - 5 in the square root.
A square root can never be negative.
That means that the lowest value y can have in the last two choices is 0.
The range does not include -4.

Now look at choice B.
sqrt(x) is at least 0.
Then you add 5.
The range does not include -4.

Now look at choice A.
sqrt(x) is at least 0.
Now you subtract 5.
The lowest value y can have is -5. That includes -4.
Choice A is the answer.
y will be at least 5.

6 0

3 years ago

Which mathematical expression is equivalent to the number sentence below

alexandr1967 [171]

Solution :

It says multiply 8 by 12 and then add 9

reading the sentence it is clear that priority is given to multiplication of 8 and 12 , once it is done then we would add 9 .

Let us first write multiplying 8 and 12 which makes it 8 x 12

the result is being add to 12 so we place 8x12 in parenthesis then add 12

which , makes it : ( 8x12) + 9

this matches to now of the given options so it is because multiplication is always given a priority comparing to addition so here parenthesis is not that important .

we can write it without parenthesis like : 8x12 +9

Answer is third option .

3 0

4 years ago

Read 2 more answers

How do you evaluate the expression 7x + 4 for x = 6

alekssr [168]

Answer:

Step-by-step explanation:

7x+4

7(6)+4

42+4

3 0

4 years ago

Read 2 more answers

You are buying decorations for a birthday party. Six rolls of crepe paper and 20 balloons cost $11.90. After you start decoratin

olga2289 [7]

Answer: $1.15

Step-by-step explanation:

The question is How much did each roll of crepe paper cost?

Let the cost of crepe paper be x

Let the cost of balloons be y.

Six rolls of crepe paper and 20 balloons cost $11.90. This will be:

6x + 20y = 11.90 ......... i

2 more rolls of crepe paper and 15 more balloons for $6.05. This will be:

2x + 15y = 6.05 ......... ii

6x + 20y = 11.90 ......... i

2x + 15y = 6.05 ......... ii

Multiply equation i by 15

Multiply equation ii by 20

90x + 300y = 178.50 ........ iii

40x + 300y = 121 ........ iv

Subtract iv from iii

50x = 57.50

x = 57.50/50

x = 1.15

Therefore, a crepe paper cost $1.15

6 0

3 years ago