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yKpoI14uk [10]
3 years ago
14

A) 3a + 5 (2a + 6) - 7a

Mathematics
1 answer:
Mrac [35]3 years ago
3 0

Answer:

A) 3a+10a+30-7a

=6a+30

B) 6b-32b+72+3b

=72+23b

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If f(x) = x2 – 2x, find:<br> X<br> -<br> f(-3) = [?]
Reptile [31]

Did you mean :

f(x) = x² - 2x, find x = -3

f(-3) = (-3)² - 2(-3)

f(-3) = 9 + 6

f(-3) = 15

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3 years ago
Cant find the answer
dedylja [7]

Answer:

Carter family = 25 hours

Davis family = 31 hours

Step-by-step explanation:

Let's say the number of hours the Carter family used their sprinkler is x and the number of hours the Davis family used their sprinkler for is y.

So combined:

x + y = 45 hours

and we are also told that:

40x + 15y = 1300 L

So we can do simultaneous equations to solve the problem.

With some rearranging, we can figure out that:

y= 45 - x

and by substituting that into the second equation:

40x + 15 (45 -x) = 40x + 675 - 15x = 1300L

25x = 1300 - 675

25x = 625

x = 25 = hours that the Carter family used their sprinkler

and we can substitute that back into the original equation to find how many hours the Davis family used their sprinkler so:

25 + y = 56

y = 31

The Davis family used their sprinkler for 31 hours whilst the Carter family used their sprinkler for 25 hours.

7 0
1 year ago
David is making rice for his guests based on a recipe that requires rice, water, and a special blend of spice, where the rice-to
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Step-by-step explanation:

At the ratio of 15:1, the 75 grams of rice in one serving will require 75/15 = 5 g of spice. David's inventory of 40 g of spice is enough for ...

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Step-by-step explanation:

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29/61

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