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Bezzdna [24]
3 years ago
9

Evaluate the following expression: -1(5,-1) + 2(1,1). A. (5,-2) B. (-3,3) C. (7,1) D. (-5,2)

Mathematics
2 answers:
Gre4nikov [31]3 years ago
8 0
I believe that the answer should be B
myrzilka [38]3 years ago
6 0
-1[5;\ -1]+2[1,\ 1]=[(-1)(5);\ (-1)(-1)]+[(2)(1);\ (2)(1)]=[-5;\ 1]+[2;\ 2]\\\\=[-5+2;\ 1+2]=[-3;\ 3]
Answer: B

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Based on the information in the diagram, what is the length of side b?
Keith_Richards [23]

Answer:

29

Step-by-step explanation:

7 0
4 years ago
1/4x + x = -3+ 1/2x, what is x?
USPshnik [31]

Answer:

x = -4

Step-by-step explanation:

Solve for x:

(5 x)/4 = x/2 - 3

Put each term in x/2 - 3 over the common denominator 2: x/2 - 3 = x/2 - 6/2:

(5 x)/4 = x/2 - 6/2

x/2 - 6/2 = (x - 6)/2:

(5 x)/4 = (x - 6)/2

Multiply both sides by 4:

(4×5 x)/4 = (4 (x - 6))/2

(4×5 x)/4 = 4/4×5 x = 5 x:

5 x = (4 (x - 6))/2

4/2 = (2×2)/2 = 2:

5 x = 2 (x - 6)

Expand out terms of the right hand side:

5 x = 2 x - 12

Subtract 2 x from both sides:

5 x - 2 x = (2 x - 2 x) - 12

5 x - 2 x = 3 x:

3 x = (2 x - 2 x) - 12

2 x - 2 x = 0:

3 x = -12

Divide both sides of 3 x = -12 by 3:

(3 x)/3 = (-12)/3

3/3 = 1:

x = (-12)/3

The gcd of -12 and 3 is 3, so (-12)/3 = (3 (-4))/(3×1) = 3/3×-4 = -4:

Answer:  x = -4

5 0
4 years ago
In a 30-60-90 triangle, the length of the side opposite the 30 degree angle is 8. Find the length of the side opposite the 60 de
nalin [4]

Answer:

The length of the side opposite the 60 degree angle 'c' = 4

Step-by-step explanation:

<u>Step(i)</u>:-

Given data ∠A = 90° , ∠B = 60° and ∠C = 30°

Given data the length of the side opposite the 30 degree angle is 8

let  'a' = 8

<u><em>step(ii)</em></u>:-

<em>By using sine rule formula in properties of triangle</em>

<em></em>\frac{a}{Sin A} = \frac{b}{Sin B} = \frac{c}{Sin C} = 2 R<em></em>

<em></em>\frac{a}{Sin A}  = \frac{c}{Sin C}<em></em>

\frac{8}{Sin 90}  = \frac{c}{Sin 30}

cross multiplication , we get

\frac{8 X sin 30}{Sin 90}  = c<em></em>

<em>we know that trigonometry formulas</em>

<em>sin 30° = </em>\frac{1}{2}<em>   and sin 90°= 1</em>

<em>C =  8 X 1/2 = 4</em>

<u><em>conclusion</em></u>:-

<em>The length of the side opposite the 60 degree angle 'c' = 4</em>

<em></em>

3 0
3 years ago
What type of triangle had side lengths of 4,7 and 9
Nina [5.8K]
A scaled triangle because they are all different lengths
4 0
3 years ago
Simplify the expression 8+3z-z
Vaselesa [24]

Answer:

8+2z

Step-by-step explanation:

8+(3z-z=2z)=

8+2z

3 0
3 years ago
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