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torisob [31]
4 years ago
15

Number 17... please help!

Mathematics
1 answer:
son4ous [18]4 years ago
4 0
<span><span><span><span>2<span>y2</span></span>+y</span>−10</span>=0</span>Step 1: Factor left side of equation.<span><span><span>(<span><span>2y</span>+5</span>)</span><span>(<span>y−2</span>)</span></span>=0</span>Step 2: Set factors equal to 0.<span><span><span><span>2y</span>+5</span>=<span><span><span>0<span> or </span></span>y</span>−2</span></span>=0</span><span><span>y=<span><span><span><span>−5</span>2</span><span> or </span></span>y</span></span>=2</span>Answer:<span><span>y=<span><span><span><span>−5</span>2</span><span> or </span></span>y</span></span>=<span>2</span></span>
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Carmela randomly selected 85 stamps from a stamp collection. Eleven of these were commemorative stamps.
uysha [10]

Answer:

(0.095, 0.165)

Step-by-step explanation:

Confidence interval :

Phat ± margin of error

Margin of Error = 0.035

Phat = x / n

Phat = 11 / 85 = 0.1294117

Hence,

Phat ± 0.035

Lower boundary = 0.1294117 - 0.035 = 0.0944

Upper boundary = 0.1294117 + 0.035 = 0.1644

(0.0944, 0.1644)

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3 years ago
Calculate the discriminant <br> x2-2x+4=0<br> A.0<br><br> B.20<br><br> C.12<br><br> D.-12
Dafna11 [192]
ax^2+bx+c=0\\the\ discriminant:\Delta=b^2-4ac\\-------------------\\Your\ example:\\x^2-2x+4=0\to a=1;\ b=-2;\ c=4\\\\thereore\ \Delta=(-2)^2-4\cdot1\cdot4=4-16=\fbox{-12}\\\\Answer:\boxed{D.\ -12}
3 0
4 years ago
Read 2 more answers
A grocery store chain has been tracking data on the number of shoppers that use coupons. The data shows that 71% of all shoppers
mariarad [96]

Answer: (0.685, 0.735)

Explanation:

First, we will compute the confidence level of the given:

\text{ Confidence Level }=\frac{36}{40}\times100\%=90\%

They gave us a margin of error of 0.025. From the given, we know that p=71%=0.71.

The confidence interval would then be:

\begin{gathered} (p-E,p+E) \\ =(0.71-0.025,0.71+0.025) \\ =(0.685,0.735) \end{gathered}

Therefore, the confidence interval would then be (0.685, 0.735)

8 0
1 year ago
Which relation is a function?<br> A: a circle <br> B: a Y<br> C: a C<br> D: a line
Anna [14]

Answer:

B.

Step-by-step explanation:

The vertical line test is what I used to test this.

6 0
3 years ago
Jim worked 40 hours last week, plus 8 overtime hours at the time-and-a-half rate. His gross pay was $884. A. What was his hourly
marishachu [46]

Answer:

Hourly rate: $17.

Hourly overtime rate: $25.5.

Step-by-step explanation:

Let x represent Jim's hourly pay.

We have been given that Jim worked 40 hours last week. So amount paid in 40 hours would be 40x.

We are also told that his over time pay is time-and-a-half rate that is 1.5x.

The amount earned for working 8 overtime hours would be 8\cdot 1.5x=12x.

Since Jim's gross pay was $884, so we will equate amount earned in 40 hours and 8 hours of overtime with 884 as:

40x+12x=884

52x=884

\frac{52x}{52}=\frac{884}{52}

x=17

Therefore, Jim's hourly rate is $17.

Overtime rate would be 1.5x\Rightarrow1.5(17)=25.5

Therefore, Jim's hourly overtime rate is $25.5.

7 0
4 years ago
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