All categories

1 year ago

NEED HELP ASAP!!

Mathematics

2 answers:

juin [17]1 year ago

8 0

The answer is C.

Note when Soro divides both sides by -2.5 to solve the equation. When multiplying/dividing by a negative number, one should always reverse the inequality sign, but Soro forgot to do this.

-2.5x≥-30

After this step, the answer SHOULD HAVE been:

x≤12

Let me know if you need any clarifications, thanks!

ICE Princess25 [194]1 year ago

7 0

Answer: c

Step-by-step explanation:

You might be interested in

As a laboratory assistant, you measure chemicals using the metric system. For your current research, you need to measure out 45

tankabanditka [31]

There are about 28 grams in an ounce so 45/28 is about 1.5

8 0

2 years ago

Read 2 more answers

A poll found that 5% of teenagers (ages 13 to 17) suffer from arachnophobia and are extremely afraid of spiders. At a summer cam

brilliants [131]

Answer:

a) Calculate the probability that at least one of them suffers from arachnophobia.

x = number of students suffering from arachnophobia

= P(x ≥ 1)

= 1 - P(x = 0)

= 1 - [0.05⁰ x (1 - 0.05)¹¹⁻⁰ ]

= 1 - (0.95)¹¹

= 0.4311999 = 0.4312

b) Calculate the probability that exactly 2 of them suffer from arachnophobia? 0.08666

= P(x = 2)

= (¹¹₂) x (0.05)² x (0.95)⁹

where ¹¹₂ = 11! / (2!9!) = (11 x 10) / (2 x 1) = 55

= 55 x 0.0025 x 0.630249409 = 0.086659293 = 0.0867

c) Calculate the probability that at most 1 of them suffers from arachnophobia?

P(x ≤ 1)

= P(x = 0) + P(x = 1)

= [(¹¹₀) x 0.05⁰ x 0.95¹¹] + [(¹¹₁) x 0.05¹ x 0.95¹⁰]

= (1 x 1 x 0.5688) + (11 x 0.05 x 0.598736939) = 0.5688 + 0.3293 = 0.8981

4 0

2 years ago

What is the value of b2 - 4ac for the following equation? 5x2 + 7x = 6 <br> 9 <br> 81 <br> 169

erastova [34]

A=5,b=7,c=-6
${7}^{2} - 4(5)( - 6) = 169$

5 0

2 years ago

Read 2 more answers

The right arrow symbol used to show the transition from a point to its image after a transformation is not contained within the

Bumek [7]

Given:

Vertices of triangle ABC are A (1,4), B(3,−2) and C(4,2).

Triangle ABC reflected over the x-axis to get the triangle A'B'C'.

To find:

The coordinates of the image A'B'C'.

Solution:

If a figure reflected over the x-axis, then rule of transformation is

$(x,y)\to (x,-y)$

Now, using this rule, we get

$A(1,4)\to A'(1,-4)$

$B(3,-2)\to B'(3,2)$

$C(4,2)\to C'(4,-2)$

Therefore, the coordinates of the image A'B'C' after a reflection over the x-axis are A'(1,-4), B'(3,2) and C'(4,-2).

7 0

2 years ago

According to a 2015 Census Bureau survey, 75,511 of the 822,959 residents of Baltimore County, Maryland, were enrolled in colleg

quester [9]

Answer:

73.4

Step-by-step explanation:

-Given that 75,511 out of 822,959 residents enrolled in the college, the probability of success is calculated as:

$P_{enrollment}=\frac{Enrollment}{Total \ Residents}\\\\=\frac{75511}{822959}\\\\=0.09176\\\\p=0.09176$

#We know that this is a binomial distribution with p=0.09176 and n=800, Expected value is calculated as:

$E(X)=np, n=800, p=0.09176\\\\=0.09176\times 800\\\\=73.4$

Hence the expected value E(X)=73.4

6 0

2 years ago