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andriy [413]
3 years ago
6

When solving a system of equations, how do you determine which method to use?

Mathematics
1 answer:
bazaltina [42]3 years ago
5 0
Substitution is best to use one one or both equations is already solved for one of the variables. Elimitation can be use if all variables have a coefficient other than 1.
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A car's speed is 45 miles per hour. How far will it go in 4 hours and 20 minutes?
shusha [124]
195 miles 

45x4=180

45 divided by 3=15

180+15=195
4 0
3 years ago
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What is sin 45°?<br> Lol I need help
Dahasolnce [82]

Answer:

1/ √2

Step-by-step explanation:

Here, we want to get the value of sin 45

Mathematically the sine is the ratio of the opposite to the hypotenuse

The opposite here is 1 while the hypotenuse is

√2

so the value of sin 45 will be;

1/ √2

6 0
3 years ago
There are 144 leaves on a tree outside of school. Each week the tree loses 8 leaves. How many leaves will be remaining on the tr
olga_2 [115]

Answer:

96

Step-by-step explanation:

Day 1: 144-8= 136

Day 2: 136-8= 128

Day 3: 128-8= 120

Day 4: 120-8= 112

Day 5: 112-8= 104

Day 6: 104-8=96

4 0
3 years ago
Solve the inequality. 1/3b + 1 &lt; -6​
olga_2 [115]

Answer:

b<-21

Step-by-step explanation:

1/3b+1<-6

1/3b<-7

*3     *3

b<-21

5 0
3 years ago
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the vertices of ABC are points A(1,1), B(4,1), and C(4,5). find the cosines of the angles of the triangle.
pickupchik [31]

Answer:

  • cos(A) = 3/5
  • cos(B) = 0
  • cos(C) = 4/5

Step-by-step explanation:

The mnemonic SOH CAH TOA reminds you of the relation between the cosine of an angle and the sides of the triangle.

  Cos = Adjacent/Hypotenuse

__

<h3>Angle A</h3>

In the given triangle, the hypotenuse is AC. The side adjacent to angle A is AB, so its cosine is ...

  cos(A) = AB/AC

  cos(A) = 3/5

__

<h3>Angle B</h3>

The right angle in the triangle is angle B. The cosine of a right angle is 0.

  cos(B) = 0

__

<h3>Angle C</h3>

The side adjacent to angle C is CB, so its cosine is ...

  cos(C) = CB/AC

  cos(C) = 4/5

7 0
2 years ago
Read 2 more answers
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