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3 years ago

Which equations are true for x = –2 and x = 2? Check all that apply.

1 answer:

4 0

А. х²-4=0; х²=4; х=±2, true. B. x²=-4; there is no solution. C. 3x²+12=0; 3x²=-12; x²=-4; there is no solution. D. 4x²=16; x²=4; x=±2, true. E. 2(x-2)²=0; 2(x²-4x+4)=0; 2x²-8x+8=0; x²-4x+4=0; x1=2; x2=2. False. The answer: A, D.

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If RY=7x+4, YC=10x-2, then what is the value of RC?

irina1246 [14]

If RY + YC = RC
7x+4=10x-2
3x=6
x=2
18+18=36=RC
The value of RC is 36

5 0

3 years ago

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vagabundo [1.1K]

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3 years ago

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In the decimal number .675, the 7 holds what place value?

siniylev [52]

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3 years ago

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What is the length of the missing leg? If necessary, round to the nearest tenth.

KengaRu [80]

Answer:

a = 3.5

Step-by-step explanation:

Let's find 'a' using Pythagoras theorem.

=> 4² = 2² + a²
=> 16 = 4 + a²
=> 12 = a²
=> a = √12
=> a = √2 x 2 x 3
=> a = 2√3
=> a = 2 x √3
=> a = 2 x 1.732
=> a = 3.464 = 3.5 (Estimated)

Hoped this helped.

$BrainiacUser1357$

4 0

2 years ago

(02.02 MC) Triangle ABC is shown. A is at negative 2, 1. B is at negative 1, 4. C is at negative 4, 5. If triangle ABC is reflec

Bezzdna [24]

Given:

The vertices of a triangle ABC are A(-2,1), B(-1,4) and C(-4,5).

Triangle ABC is reflected over the x‐axis, reflected over the y‐axis, and rotated 180 degrees.

To find:

The point B'.

Solution:

If a figure reflected over x-axis, then

$(x,y)\to (x,-y)$

$B(-1,4)\to B_1(-1,-4)$

If a figure reflected over y-axis, then

$(x,y)\to (-x,y)$

$B_1(-1,-4)\to B_2(-(-1),-4)$

$B_1(-1,-4)\to B_2(1,-4)$

If a figure rotated 180 degrees about the origin, then

$(x,y)\to (-x,-y)$

$B_2(1,-4)\to B'(-(1),-(-4))$

$B_2(1,-4)\to B'(-1,4)$

So, the coordinate of point B' are (-1,4).

Therefore, the correct option is A.

6 0

2 years ago