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____ [38]
3 years ago
13

A certain randomly selected sample of 125 registered voters showed that 20% of them voted in the most recent school board electi

on. How many of these voters actually voted in that election?
Mathematics
1 answer:
Solnce55 [7]3 years ago
6 0
125 registered
20% voted
20% of 125
(20%/100%) * 125
0.2 * 125
25

25 people actually voted.
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2. The Lamberti family is building a rectangular deck that measures 30 feet by 22 feet. They need to run an electric line across
schepotkina [342]

Answer:

37 ft

Step-by-step explanation:

The Pythagorean theorem tells you the length of the diagonal is the square root of the sum of the squares of the side lengths:

diagonal = √(30^2 +22^2) = √1384 ≈ 37 . . . . feet

6 0
3 years ago
Which figures have a volume greater than 500 cubic inches? Choose all that apply.
yaroslaw [1]

Answer:

All shapes except the cone with 5in radius and 8in height

Step-by-step explanation:

Volume of the cylinder with radius 5in and height 8in is expressed as;

V = πr²h

V = 3.14*5²*8

V = 3.14*25*8

V = 628 square inches

The volume of the cylinder is greater than 500in³

Volume of the cone with radius 5in and height 24in is expressed as;

V = 1/3πr²h

V = 1/3*3.14*5²*24

V = 3.14*25*8

V = 628 square inches

The volume of the cone is greater than 500in³

Volume of the spheree with radius 5in is expressed as;

V = 4/3πr³

V = 4/3π(5)³

V = 4/3 * 3.14 * 125

V = 523.33 square inches

The volume of the sphere is greater than 500in³

6 0
3 years ago
The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a population standard deviati
garik1379 [7]

Answer:

Their welders earn $50,000 annually.

Step-by-step explanation:

Given : \mu = 50,000

           \sigma = 2000

           n = 100

          \bar{x}=50350

To Find : The ship building association wishes to find out whether their welders earn more or less than $50,000 annually.

Solution :

H_0:\mu = 50000\\H_a: \mu \neq 50000

n = 100

Since n > 30

So we will use z test

z= \frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}

Substitute the values

z= \frac{50350-50000}{\frac{2000}{\sqrt{100}}}

z=1.75

Refer the z table for p value

p value = 0.9599

α= 0.05

Since p value > α

So we accept the null hypothesis .

Hence  their welders earn $50,000 annually.

4 0
3 years ago
Please help this is important
deff fn [24]

Answer:

below

Step-by-step explanation:

You've been asked to use specific x-values. Simply replace the x in the equation for each of your x-values then graph.

first equation!!

(x,y)

y=-2x+5

x-value: -2

y=-2(-2)+5

y=4+5

y=9

(-2, 9)

x-value: -1

y=-2(-1)+5

y=2+5

y=7

(-1, 7)

x-value: 0

y=-2(0)+5

y=0+5

(0, 5)

x-value: 1

y=-2(1)+5

y=-2+5

y=3

(1, 3)

x-value: 2

y=-2(2)+5

y=-4+5

y=1

(2, 1)

second equation :)

(x,y)

y=x^2 +2

x-value: -2

y=-2^2 +2

y=4+2

y=6

(-2, 6)

x-value: -1

y=-1^2 +2

y=1+2

y=3

(-1, 3)

x-value: 0

y=0^2 +2

y=0+2

(0, 2)

x-value: 1

y=1^2 +2

y=1+2

y=3

(1, 3)

x-value: 2

y=2^2 +2

y=4+2

y=6

(2, 6)

third equation

(x,y)

y=√2 x+1

x-value: 1

y=√2 1+1

y=1+1

y=2

(1, 2)

x-value: 4

y=√2 4+1

y=2+1

y=3

(4, 3)

x-value: 9

y=√2 9+1

y=3+1

y=4

(9, 4)

x-value: 16

y=√2 16+1

y=4+1

y=5

(16, 5)

x-value: 25

y=√2 25+1

y=5+1

y=6

(25, 6)

fourth (last) equation :-)

(x,y)

y=4/x

x-value: -4

y=4/-4

y=-1

(-4, -1)

x-value: -2

y=4/-2

y=-2

(-2, -2)

x-value: -1

y=4/-1

y=-4

(-1, -4)

x-value: 0

y=4/0

y=0

(0, 0)

x-value: 1

y=4/1

y=4

(1, 4)

x-value: 2

y=4/2

y=2

(2, 2)

x-value: 4

y=4/4

y=1

(4, 1)

5 0
3 years ago
Can someone help me with the question.,.
xeze [42]

15/42 3X5 = 15, 7X6 = 42

5 0
3 years ago
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