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AysviL [449]
3 years ago
15

How old was Lisa x years ago if she is now 13? Which expression represents this?

Mathematics
2 answers:
svlad2 [7]3 years ago
7 0

Answer:

a = 13 - x

Step-by-step explanation:

Age = a

(Any other letter of substitution for age would be fine)

For example if x was 5 :

a = 13 - 5

a = 8

For further study:

  • Research algebra on either website. (eg: Maths Is Fun, Khan Academy...)
gogolik [260]3 years ago
6 0

Answer:13-x= y

Step-by-step explanation:

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K'Drien has a recipe that needs 3/4 tablespoon of butter for every 2
Orlov [11]

Answer:

6/4. Simplified, is 1 2/4

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4 0
2 years ago
Round 389,422 to the ten thousand
frosja888 [35]
To round 389,422 to the ten thousand, you need to go to the second number which is 8 and round it to the right. To the right of 8 is 9 so if a number is more than 5 you round 8 to 9. Then all the numbers after 8 turn into zeros

So... your answer is:

390,000

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3 years ago
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MrMuchimi

Answer:

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Step-by-step explanation:

6 0
2 years ago
A closed box with a square base is to have a volume of 85. 75 cm^3. the material for the top and bottom of the box costs ​$3.00
tiny-mole [99]

We can create two equations here:

(1) Volume = area of square * height of box

85.75 = s^2 h

(2) Cost = 3 * area of square + 1.5 * area of side box

C = 3 s^2 + 1.5 s h

 

From (1), we get:

h = 85.75 / s^2

 

Combining this with (2):

C = 3 s^2 + 1.5 s (85.75 / s^2)

C = 3 s^2 + 128.625 s-

 

Taking the 1st derivative and equating dC/ds = 0:

dC/ds = 6s – 128.625 / s^2 = 0

Multiply all by s^2:

6s^3 – 128.625 = 0

6s^3 = 128.625

s = 2.78 cm

 

So h is:

h = 85.75 / s^2 = 85.75 / (2.78)^2

h = 11.10 cm

 

So the dimensions are 2.78 cm x 2.78 cm x 11.10 cm

 

The total cost now is:

C = 3 (2.78)^2 + 1.5 (2.78) (11.10)

C = $69.47

8 0
2 years ago
1.) Solve for c:<br> 4c + 5 &gt; -c-5
Svet_ta [14]

Answer:

Step-by-step explanation:

5 0
3 years ago
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