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Oxana [17]
3 years ago
14

The area of the poster is (x^2+2x-15) inches the width is (x-3) inches calculate the dimensions of the poster board when x=14

Mathematics
1 answer:
givi [52]3 years ago
4 0

Answer:

The poster is 11 inches wide and 19 inches in height.

Step-by-step explanation:

We take the given equation: (x^2+2x-15) and we add in 14 as our x variable:

((14)^2+2(14)-15) the answer we get from that is 209. The area of the poster is 209 square inches. Then we find the width by taking (x-3) in this case x is 14 so the width of the poster is 11. In order to find the height we divide the height by the width and we get 19.

Therefore:

Height= 19 Inches

Width= 11 Inches

Total Area= 209 Square Inches

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The director of a state agency believes that the average starting salary for clerical employees in the state is less than ​$35 c
MrRissso [65]

Answer:

There is not enough evidence to conclude that  average starting salary for clerical employees in the state is less than ​$35,000 per year.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 35,000 dollars per year

Sample mean, \bar{x} = 34,700 dollars per year

Sample size, n = 100

Alpha, α = 0.10

Population standard deviation, σ = 3,500 dollars per year

First, we design the null and the alternate hypothesis

H_{0}: \mu = 35,000\text{ dollars per year}\\H_A: \mu < 35,000\text{ dollars per year}

We use one-tailed z test to perform this hypothesis.

Formula:

z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }

Putting all the values, we have

z_{stat} = \displaystyle\frac{34700 - 35000}{\frac{3500}{\sqrt{100}} } = -0.8571

Now, z_{critical} \text{ at 0.10 level of significance } = -1.28

Since,  

z_{stat} > z_{critical}

We fail to reject the null hypothesis and accept the null hypothesis.

Thus, there is not enough evidence to conclude that  average starting salary for clerical employees in the state is less than ​$35,000 per year.

3 0
3 years ago
Rachel has a drawerful of pop, rock, metal, and country CDs. The table gives the probability of randomly picking a CD of each ty
AlekseyPX

Answer:

country CDs. The table gives the probability of randomly picking a CD of each type from. ... Music Style Probability of Picking a CD pop 0.2 rock 0.1 metal 0.3 country 0.4 Rachel picks a CD 150 times, replacing each pick before the next draw.

Step-by-step explanation:

7 0
3 years ago
What is the volume of the item described? An ice cream cone with a cone of radius 2 cm and height of 9 cm with a hemisphere of i
Ratling [72]
Volume of hemisphere = 2πr³/3
Volume of cone = πr²h/3

Where r = 2 and h = 9

Volume = volume of hemisphere + volume of cone
Volume = 2π(2)³/3 + π(2)²(9)/3
Volume = 16π/3 + 36π/3
Volume = 52π/3
7 0
4 years ago
Read 2 more answers
For each pair of numbers, tell: By what percent of the first number is the second number larger? By what percent of the second n
snow_lady [41]

Answer:

Part A: 100%
Part B: 50%

Step-by-step explanation:

The difference between 10 and 5 is 5

5 is 100% of 5, so 10 is 100% greater than 5 (part A)

  • 5/5 = 1 = 100%

5 is 50% of 10, so 5 is 50% less than 10 (part B)

  • 5/10 = 1/2 = 50%

Part A is 100%, and Part B is 50%

-Chetan K

4 0
2 years ago
Which of the following quadratic functions has a graph that opens downward? A.y= 3/2x^2 -3x+15 B.y= 5/2x-3x^2 C.y= 3x^2-x-1 D.y=
gladu [14]

it says if

ax^2+bx+c=0

a<0

answer is D because, there is (-) near of x^2

3 0
3 years ago
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