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3 years ago

You purchase 3 items for $4.23. About how much did you spend? $15 $10 $12 $13

Mathematics

1 answer:

anzhelika [568]3 years ago

7 0

Answer

Step-by-step explanation:

4+4+4=12+.23+.23+.23=12.69 and round up to 13

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Rewrite y+6=-3(x+5) in ax+by=c

scoundrel [369]

Answer:

Step-by-step explanation:

y+6 = -3x-15

3x + y= -21

8 0

3 years ago

If N is a 3-digit integer, and the result of reversing the digits of N is the number M, what is the maximum value of N-M? Please

Lena [83]

Answer:

The maximum value of N-M will be 792

Step-by-step explanation:

For N - M to be maximum

N must be very large and M must be very small

largest 3 numbers occur in 900's and smallest 3 digit numbers occur in 100's

so we need such an N which starts with 9 and ends with 1 so that on reversing it produces a number starting with 1.

If N = 901 , M will be 109

N - M = 792

This is the largest possible value of N - M

All other values of N-M will give a smaller value than 792.

5 0

4 years ago

PLEASE HELP WITH GEOMETRY!! WILL GIVE BRAIN!!!

Drupady [299]

The answer to this question is d

3 0

3 years ago

Read 2 more answers

if 60 people were asked their favorite color how many people preferred blue when 26% were red ,16%green,30%blue,4%black and 24%y

REY [17]

Answer:

18 people preferred the color blue

Step-by-step explanation:

you switch the percent to a decimal and .30*60 is 18

6 0

3 years ago

Read 2 more answers

Sabiendo que cada persona unos 4 500 000 glóbulos rojos por milímetro cúbico y que su cantidad de sangre es de 5 litros A) Que l

love history [14]

Answer:

Part A) distance covered by the aligned red cells is: 180000 Km

Part B) 8000000 bacteria (8 million bacteria)

Step-by-step explanation:

Part A)

Let's first find the total number of red cells that the person has in the 5 liters, knowing that there are 4,500,000 of them in a cubic millimetre:

Since 1 liter contains 1,000,000 cubic millimetres, then, in 5 liters there must be 5 times that number of cubic millimetres. That is a total of 5,000,000 cubic millimetres.

Since in each cubic millimetre there are 4,500,000 red cells, then the number of red cells in the 5 liters must be the product of these two quantities:

4,500,000 x 5,000,000 = 22,500,000,000,000 red blood cells.

Now, to find the distance they will cover aligned one after the other, knowing that their average diameter is 0.008 mm is:

22,500,000,000,000 x 0.008 mm= 180000000000 mm

$22.5\,\,10^{12} * 8\,\,10^{-3}=1.8\,\,10^{11}$ mm

In order to convert this distance into Km as requested, we use the fact that 1 mm = 0.000001 Km, or using exponents in base ten:

1 mm = $10^{-6}\,\,Km$

Then, the distance covered in kilometers is:

$1.8\,\,10^{11}\,*\,10^{-6} \,\,Km=1.8\,\,10^{5}\,\,Km=180000\,\,Km$

Part B)

The vaccine contains a total of $10^8$ bacteria per $cm^3$

In order to find how many bacteria we have in 80 $mm^3$ of the vaccine, we first need to convert 80 $mm^3$ into $cm^3$ :

$80\,\, mm^3 = 0.08 \,\,cm^3$

Then, if in one $cm^3$ there is $10^8$ bacteria, in $0.08\,\,cm^3$ there would be: $0.08\,*\,10^8$ bacteria. That is: $8\,\,10^6$ bacteria = 8000000 bacteria (eight million bacteria)

8 0

3 years ago