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s344n2d4d5 [400]
3 years ago
7

Evaluate the expression 3y - 15 using y=7

Mathematics
1 answer:
Rufina [12.5K]3 years ago
8 0

Answer:

The answer is 6

Step-by-step explanation:

3(7)-15

3 ×7=21

21-15=6

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Mr. Rocha used 15 lemons to make2 1/2 gallons of lemonade. How many lemons are needed to make one gallon of lemonade?
kherson [118]

Answer:

6

Step-by-step explanation:

15 lemons = 2.5 gallons of lemonade

Divide both sides by 2.5

6 = 1

6 lemons per 1 gallon.

3 0
3 years ago
Solve 729 s-⁵ = 3² (1-s) for S.​
sweet [91]

Answer:

No real solutions.

Step-by-step explanation:

729s^-5 = 729/s^5

729/s^5 = 3^2(1-s) = 9(1-s)

729=9(1-s)(s^5)

(1-s)(s^5)=81

s^5-s^6=81

Because 81 > 0 this means s^6 must be less than s^5. This is never possible as 6 is even so is always positive and is always greater in magnitude than s^5. The only time this isnt the case is when s is a decimal less than 1, but then the difference would be also less than 1 and not 81.

5 0
3 years ago
HELP PLZZZZZZZ
Triss [41]

Answer:

$57.40

Step-by-step explanation:

$47.83 + $9.57 = $57.40

4 0
3 years ago
Tissues are sold in packs and boxes A pack holds 20 tissues and a box holds 120 tissues Sia buys P packs of tissues and B boxes
Fynjy0 [20]

Answer:

T=120(P+B)

Step-by-step explanation:

If a pack holds 120 tissues, then P packs will hold (P×120) tissues

This implies,

1 pack : 120 tissues

P packs : 120P tissues

Also, if a box holds 120 tissues, then B boxes will (B×120) tissues

This implies,

1 box : 120 tissues

B boxes : 120B tissues

Writing a formula in terms of T, where T is the total we obtain,

T=120P +120B

Using the idea of factorization we obtain

T=120(P+B)

8 0
3 years ago
Molly invested $50,000 in various stocks
fgiga [73]

Answer:

  $10,000

Step-by-step explanation:

Let b represent the amount invested in bonds. Then 50,000 - b wil be the amount invested in stocks. Molly's total return is ...

  0.15b + 0.18(50000-b) = 8700

  -0.03b +9000 = 8700 . . . . simplify

  300 = 0.03b . . . . . . . . . . . . add .03b-8700

  10,000 = b . . . . . . . . . . . . . divide by 0.03

Molly invested $10,000 in bonds.

3 0
3 years ago
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