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zepelin [54]
3 years ago
6

Plz help on this one if you can. Thanks

Mathematics
1 answer:
vovangra [49]3 years ago
3 0
Take the area and divide that by the length
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HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP
Alborosie

Answer:

CBA = 53°

DBC = 39°

Step-by-step explanation:

You have 2 angles, CBA and DBC.

Together, these form the angle DBA. (See attached image)

We know the following about the 2 angles:

CBA = 8x - 3

DBC = 5x + 4

Like we said, both of these together form the angle DBA. Thus:

DBA = CBA + DBC

Let's put in the values we know, 8x-3, 5x+4, instead of CBA and DBC:

DBA = 8x - 3 + 5x + 4

DBA = 13x - 3 + 4

DBA = 13x + 1

We also know that:

DBA = 92 (from the question)

Let's set our expression 13x + 1 equal to 92.

DBA = 13x + 1

DBA = 92

13x + 1 = 92

Subtract 1 from both sides:

13x = 91

Divide both sides by 13:

x = 91 / 13

x = 7

Now that we know x, we can find what CBA and DBC are.

CBA = 8x - 3

Replace x with 7:

CBA = 8*7 - 3

CBA = 56 - 3

CBA = 53

DBC = 5x + 4

Replace x with 7:

DBC = 5*7 + 4

DBC = 35 + 4

DBC = 39

Answer:

CBA = 53°

DBC = 39°

4 0
3 years ago
A truck enters a highway driving 60 mph. A car enters the highway at the same place 11
Katena32 [7]
It would take the car at least 8 minutes for it to pass the truck .
6 0
4 years ago
Read 2 more answers
Nathan solved this problem.
SCORPION-xisa [38]
D the answer is 34.5 so it should be closer to 35
6 0
4 years ago
Read 2 more answers
Tests show that the hydrogen ion concentration of a sample of apple juice is 0.0003 and that of ammonia is 3.1 x 10^-9. Find the
scoundrel [369]
PH can be calculated using the following equation 
pH = -log [H₃O⁺]
for apple juice the hydronium /hydrogen ion concentration is 0.0003
pH = -log (0.0003)
pH = 3.5
correct answer is C

For ammonia 
pH = -log (3.1 x 10⁻⁹)
pH = 8.5 
answer should be 8.5
5 0
3 years ago
Read 2 more answers
A valve in a full 6000 gallon water tank is slowly opening. Water flows out of the tank through the valve. The flow rate in gall
Wittaler [7]
The volume of the gallon is 6000 gallon
the rate of water flow per min is f(t)=300t^2
a] amount of water that flowed in the first 7 minutes=7/60 hours will be:
f(7)=300(7/60)^2
solving the above we get
f(7)=7/12 gallons

b] The time taken for the tank to be empty will be as follows:
amount of water that will flow out for the tank to be empty will be 6000 gallons
thus,
6000=300t^2
this can be simplified to
20=t^2
t^2-20=0
solving this we get:
t=-2√5 or 2√5
the time taken for the tank to be empty will be t=2√5 hours=5.4721 hours



8 0
3 years ago
Read 2 more answers
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