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Gala2k [10]
3 years ago
12

Which shows equivalent expressions a^2+3b-2a^2=3^a+3b-4a^2 a^2+3b-2a^2=3^a+4b-4a^2 -a^2+3b-2a^2=3a^2+3b -a^2+3b+2a^2=3a^+4b-2a^2

​
Mathematics
1 answer:
scoray [572]3 years ago
6 0
I don’t think this is formatted correctly, but I think it may be the 2nd one.
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a school librarian surveyed students about their favorite type of novel. The results are shown in the table at the right. What p
Brrunno [24]
18+10+26+4=58 
26.58= 0.44827
About 44.83%
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3 years ago
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A ladder 15 feet long leans against a wall and forms an angle of 45º with the ground. How far from the wall is the ladder?
bezimeni [28]
The ladder is the hypotenuse of a 45 45 90 triangle.
The legs of a 45 45 90 triangle = hypotenuse / sqroot (2)

15 / 1.414 = 10.608

(Incidentally it is the "bottom" of the ladder that is 10.608 feet from the wall.  The "top" of the ladder is touching the wall.  LOL)

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3 years ago
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Each year, Monica deposits $200 into her savings that earns simple interest at an annual rate of 3.5%. What will her balance be
AURORKA [14]

Answer:

2,100

Step-by-step explanation:

$200 * 3.5= $700

$700 * 3= $2,100

5 0
3 years ago
The larger of two numbers is 2 more than four times the smaller. Their sum is 67. Find the numbers.
harkovskaia [24]
X = 2 + 4y           
67 = x + y

67 = (2 + 4y) + y = 2 + 5y
65/5 = 13 = y
67 - 13 = x = 54.
x = 54
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6 0
3 years ago
A research team conducted a study showing that approximately 20% of all businessmen who wear ties wear them so tightly that they
Masteriza [31]

Answer:

1. 0.9648

2. 0.602

3. 0.0352

4. 0.398

Step-by-step explanation:

We solve using binomial probability

n = 15

P = 20% = 0.2

1. At least 1 is tight

= P(X>=1)

P(X>=1) = 1-p(X= 0)

= P(x=0)

= 15C0(0.20)⁰(1-0.20)^15-0

= 15C0(0.20)⁰(80)¹⁵

= 0.0352

P(x>=1) = 1-0.0352

= 0.9648

2.

More than 2 ties tight

P(X>2)

P(X>2) = 1-p(X<=2)

p(X<=2) = p(x=0) + p(x=1) + p(x=2)

= p(x=0) = 0.0352

p(x=1) = 15C1(0.20)¹(0.80)¹⁴

= 0.1314

p(x=2) = 15C2(0.20)²(0.80)¹³

= 0.2309

P(x>2) = 1-(0.0352+0.1314+0.2309)

= 0.602

3.

No ties is tight

P(X = 0)

= 15C0(0.20)⁰(0.80)¹⁵

= 0.0352

4.

At least 3 are not tight

This says that at most we have 3 to be too tight

= p(X<=2) = p(x=0) + p(x=1) + p(x=2)

= 0.0352+0.1319+0.2309

= 0.398

7 0
3 years ago
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