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Sphinxa [80]
3 years ago
13

Evaluate the expression when a = 4 and c = -4. -a +2c​

Mathematics
2 answers:
Vladimir79 [104]3 years ago
8 0
Answer: -12
-(4)+2(-4)=-12
I hope this helps!!
gizmo_the_mogwai [7]3 years ago
6 0

Answer:

-12

Step-by-step explanation:

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a forest ranger in a 140-foot observation tower sees a fire moving in a direct path toward a lake. the angle of depression to th
Setler79 [48]

Answer:

1675 ft

Step-by-step explanation:

For us to calculate how close the windmill is to the fire, if we imagine it as a triangle, the distance from watch tower to the fire will be:

tan θ= opposite/adjacent

opposite=140 ft

adjacent = x

θ=3°

Thus;

tan 3 = 140/x

x=140/tan 3

x = 2,671.359 ft

Now, the distance from watch tower to windmill will be:

tan θ=opposite/ adjacent

θ=8°

opposite=140 ft

adjacent=y

thus

tan 8 = 140/y

y = 140/tan8

y=996.15 ft

Now, the distance between fire and wind mill will be:

x - y = 2671.359 - 996.15

x - y = 1675.209 ≈ 1675 ft

6 0
4 years ago
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Why was Copernicus' work controversial?
leonid [27]
Copernicus proposed a heliocentric model in which the earth revolved around the sun, not the other way, and this went against what the church was saying at the time: the church, which insisted it is always right, said that the sun revolver around the earth.


The correct answer is: <span>C. His scientific discoveries undermined the power of the Church. </span>
5 0
3 years ago
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when I double my number, add four, and then subtract my number and subtract 3, I get my number plus 1
Musya8 [376]
4 because doubled it equals eight, add four it equals twelve, subtract four it equals eight, subtract three and it equals five. 
3 0
3 years ago
If two 12-sided dice are rolled, what is the probability that both numbers will be even?
geniusboy [140]
1/4 I think, I’m not sure
7 0
3 years ago
PLEASE HELP ASAP WORTH 30 POINTS Between which two whole numbers is ⎯⎯⎯⎯√square root of 12 ?
Brilliant_brown [7]

Answer:

Between 3 and 4

Step-by-step explanation:

3^2 = 3 × 3 = 9

4^2 = 4 × 4 = 16

12 is between 9 and 16

3 0
3 years ago
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