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Nat2105 [25]
2 years ago
13

What is the perimeter of a square with an area of 81 cm2

Mathematics
2 answers:
Bad White [126]2 years ago
7 0

Answer:

36cm

Step-by-step explanation:

A square has 4 equal sides so you can find the square root of 81 which is 9. Each side is 9cm, so just add the four sides and it gives you 36. Hope this helps^^

tatyana61 [14]2 years ago
6 0

Answer:

36 cm

Step-by-step explanation:

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1/4(z +3z)+ 7=−z + 1 please help with this ive been stuck
erastovalidia [21]

Answer:

<em><u>z = -3</u></em>

Step-by-step explanation:

<u>Step 1: Simplify both sides of the equation. </u>

z+7=−z+1

<u>Step 2: Add z to both sides. </u>

z+7+z=−z+1+z

2z+7=1

<u>Step 3: Subtract 7 from both sides. </u>

2z+7−7=1−7

2z=−6

<u>Step 4: Divide both sides by 2. </u>

<u>2z</u>   =  <u>−6 </u>

2      2

z=−3

5 0
3 years ago
Read 2 more answers
1.If a line with a slope of -3 crosses the y-axis at (0,7), what is the equation of the line?
gogolik [260]

y = mx + b    "m" is the slope, "b" is the y-intercept (the y value when x = 0)


1. slope: -3

y-intercept: 7

y = -3x + 7

Your answer is B

y + 3x = 7   Subtract 3x on both sides

y = -3x + 7


2. y + 9(x + 3) = 0     Multiply/distribute 9 into (x + 3)

y + 9x + 27 = 0      Subtract 9x and 27 on both sides to get "y" by itself

y = -9x - 27

slope: -9

y-intercept: -27 or (0,-27)

Your answer is D


3. Point-slope form:   y - y₁ = m(x - x₁)

slope: -11

(x₁ , y₁) = (-5, 7)


y - 7 = -11(x - (-5))  The two negative signs becomes a positive

y - 7 = -11(x + 5)

Your answer is C


4. For this question, I think you get it from point-slope form to slope-intercept form (I'm not sure, but you still get the same answer if you just do slope-intercept form)

slope: -4

(x₁ , y₁) = (2, -8)


y - y₁ = m(x - x₁)

y - (-8) = -4(x - 2)

y + 8 = -4(x - 2)     Multiply/distribute -4 into (x - 2)

y + 8 = -4x + 8       Subtract 8 on both sides to get "y" by itself

y = -4x

Your answer is A

3 0
3 years ago
A baby is born weighing 120 ounces. At 1 year, the same baby weighs 14 pounds. How many pounds did the bay gain?
AnnyKZ [126]
The baby gained 6.5 pounds
6 0
2 years ago
$1400 principal annual earning 6% compound semiannually, after 10 years
shusha [124]
The formula to use is:
A=P(1+r/n)^nt
Plug in the values:
A=1400(1+.06/2)^2(10)
A=$2528.56 (rounded off)
Make sense?
3 0
3 years ago
Triangle PQR has coordinates P(–8, 3), Q(–8, 6), and R(–3, 6). If the triangle is translated by using the rule mc013-1.jpg, what
guapka [62]
The answer is D
 
P'(-4,-3),Q'(-4,0),R'(1,0)
6 0
3 years ago
Read 2 more answers
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