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stepladder [879]

3 years ago

8

21. Find the perimeter of the triangle: 60 degrees, 60 degrees,

id="TexFormula1" title="4 \sqrt{15 } " alt="4 \sqrt{15 } " align="absmiddle" class="latex-formula">

1 answer:

barxatty [35]3 years ago

6 0

Answer:

120+ 4(square root)15

120+15.49=135.49

135.49 is the perimeter

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Please help!! I’m stuck on this

beks73 [17]

Answer:

B. $x = -4\,\lor \,x = -1$

Step-by-step explanation:

Let $\sqrt{-4-5\cdot x} = x$ , we solve for $x$ by algebraic means.

1) $\sqrt{-4-5\cdot x} = x$ Given

2) $-4-5\cdot x = x^{2}$ Definition of power/Symmetry of equality

3) $x^{2}+5\cdot x + 4 = 0$ Compatibility with addition/Commutative and associative properties/Existence of additive inverse/Modulative property

4) $(x+4)\cdot (x+1) = 0$ $x^{2}+(a+b)\cdot x +a\cdot b = (x + a)\cdot (x+b)$

5) $x = -4\,\lor \,x = -1$ Result

Hence, the correct answer is B.

7 0

3 years ago

6 ) hey pls help me with his I have the answers all I need is to show the work

morpeh [17]

Answer:

8

Step-by-step explanation:

use pythagoras theorem

a^2+b^2=c^2

a^2+6^2=10^2

a^2=10^2-6^2

a^2=100-36

a^2=64

a=square root of 64

a=8

5 0

3 years ago

Walter pays $4 for each gallon, g, of gas for his lawn mower. He uses a gift card worth $5 to reduce the amount he owes for his

dem82 [27]

Hope this helps check a website calles math-way without the dash

4 0

3 years ago

What is the value of a?

Elis [28]

${a}^{2} = 4 \times 18 \\ {a }^{2} = 72 \\ a = 6 \sqrt{2}$

4 0

3 years ago

A survey showed that 82% of adults need correction (eyeglasses, contacts, surgery, etc.) for their eyesight. If 12 adults are

Aloiza [94]

Probability of an adult who needs correction = 82% or 0.82

So, probability of an adult who does not needs correction = 1 - 0.82 = 0.18

If 12 adults are randomly selected, the probability that at least 11 of them need correction for their eyesight is:

12C11 $(0.82)^{11}(0.18)^{12-11}$ + 12C12 $(0.82)^{12}(0.18)^{12-12}$

= 12*0.11*0.18 + 1*0.09*1

= 0.238+0.09

= 0.328 or 0.33

And, yes, 11 is significantly a high number of adults requiring eyesight correction.

7 0

3 years ago

Read 2 more answers