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maksim [4K]
3 years ago
13

Please help me please I really need help

Mathematics
2 answers:
tatyana61 [14]3 years ago
5 0

Answer:

(5x-7)(9x²-4x-8)

=5x(9x²-4x-8)-7(9x²-4x-8)

=45x³-20x²-40x-63x²+28x+56

=45x³-83x²-12x+56

Over [174]3 years ago
5 0

Answer:

45x³-83x²-17x+56

Step-by-step explanation:

(5x-7)(9x²-4x-8)

5x(9x²-4x-8) -7 (9x²-4x+56)

45x³-20x²-45x-63x²+28x+56

45x³-83x²-17x+56

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Bhavik bought 3 liters of milk and 5 loaves of bread for a total of $11. A month later he bought 4 liters of milk and 4 loaves o
Greeley [361]
Let the price of 1 liter of milk be m, and let the price of 1 loaf of bread be b.

3 liters of milk cost 3m.
5 loaves of bread cost 5b.
The total is $11.
That gives us the first equation:

3m + 5b = 11

4 liters of milk cost 4m.
4 loaves of bread cost 4b.
The total is $10.
That gives us the second equation:

4m + 4b = 10

We have a system of two equations.

3m + 5b = 11
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Multiply the first equation by -4.
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Then, add the equations.

      -12m - 20b = -44
  +   12m + 12b = 30
---------------------------
                   -8b = -14

b = 14/8 = 7/4 = 1.75

Now substitute b with 1.75 in the first original equation.

3m + 5b = 11

3m + 5(1.75) = 11

3m + 8.75 = 11

3m = 2.25

m = 0.75

Answer: A liter of milk costs $0.75, and a loaf of brad costs $1.75.
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4 years ago
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You have vials containing 250 milligrams of aminophylline in 10 milliliters. How many milliliters are required to administer 300
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Answer:

<em>Answer: 12 milliliters</em>

Step-by-step explanation:

<u>Proportions</u>

Each vial contains 250 milligrams of aminophylline in 10 milliliters. This means the concentration of aminophylline in the vials is 250/10 = 25 milligrams/milliliter.

To administer 300 milligrams of aminophylline, we need to find the number of milliliters according to the concentration calculated above.

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