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2 years ago

6

There are 15 people in a party, including Hannah and Sarah. We divide the 15 people into 3 groups, where each group has 5 people

. What is the probability that Hannah and Sarah are in the same group?

2 answers:

creativ13 [48]2 years ago

8 0

Answer:

0,333

Step-by-step explanation:

by fractions

Sindrei [870]2 years ago

5 0

Answer:15/3

Step-by-step explanation:

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What is the length of ac?

leonid [27]

Answer:

Step-by-step explanation:

Given triangles are similar, so we setup a proportion

(140-x)/81 = x/9

solving gives x = 14

AC = 140-x = 140-14 = 126

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The process of using the same or similar experimental units for all treatments is called:______

Charra [1.4K]

Answer:

replicating

Step-by-step explanation:

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2 years ago

Find a single expression that represents the area of the outer ring of the circle if the area of the whole circle is represented

sp2606 [1]

Answer: The answer is $A_o=2\pi\sqrt{\dfrac{7}{22}(25x^2-12x-9)}.$

Step-by-step explanation: Given that the area of the whole circle is represented by the expression

$A_c=25x^2-12x-9.$

We are to find the area of the outer ring of the circle, i.e., to find the circumference of the circle.

Now, if 'r' represents the radius of the circle, then we have

$A_c=\pi r^2\\\\\Rightarrow \dfrac{22}{7}r^2=25x^2-12x-9\\\\ \Rightarrow r^2=\dfrac{7}{22}(25x^2-12x-9)\\\\\Rightarrow r=\sqrt{\dfrac{7}{22}(25x^2-12x-9)}.$

Thus, the area of the outer ring is

$A_o=2\pi r=2\pi\sqrt{\dfrac{7}{22}(25x^2-12x-9)}.$

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2 years ago

Two unique letters are chosen at random from the alphabet.

ElenaW [278]

A - choosing letter A first

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Rudy invested $2460 in a money market account for 3 and 1/2 years. He earned $452 in simple interest. Which best represents the

antiseptic1488 [7]

Answer:

B. 5 and 1/4 percent

Step-by-step explanation:

Step one:

given

principal= $2460

time= 3 and 1/2 years= 3.5 years

SI= $452

Required

The rate

Step two:

we know that

SI= PRT/100

substituting our data we have

452= 2460*R*3.5/100

452=8610R/100

cross multiply

452*100= 8610R

divide both sides by 8610

45200/8610= R

R= 5.25%

R= 5 and 1/4 percent

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2 years ago