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goldenfox [79]
2 years ago
6

Bobby had a party while his parents were away for the weekend. Bobby estimated that if his 9 friends help him to clean the house

, they will be able to finish cleaning in 8 hours before his parents return. After two hours of cleaning, Bobby's parents call and say they are just two hours from home. How many more friends does Bobby need to call for help to finish cleaning in time?
Mathematics
1 answer:
Murljashka [212]2 years ago
7 0

Answer:

20 friends

Step-by-step explanation:

9 FRIENDS

2 HOURS

10 PEOPLE

2 HOURS

30 PEOPLE

2 HOURS

WORKS :D

Sorry if this is a little weird I did it the way I did it but I know the answer is correct. The work may not seem right to you -.- but :D I understand it...

Guest
1 year ago
dude, you can't even call that an explanation, may you please elaborate on what you mean?
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This diagram shows triangles ABC and PQR. ABC is mapped to PQR by combining two single transformations. The first is a rotation
dedylja [7]

Answer:

enlarge by -2 by centre point (3,1)

Step-by-step explanation:

6 0
2 years ago
A particular convex pentagon has two congruent, acute angles. The measure of each of the other interior angles is equal to the s
NNADVOKAT [17]

1. First, you must apply the formula for calculate the sum of the interior angles of a regular polygon, which is shown below:


 (n-2) × 180°


 "n" is the number of sides of the polygon (n=5).


 2. Then, the sum of the interior angles of the pentagon, is:


 (5-2)x180°=540°


 3. The problem says that the measure of each of the other interior angles is equal to the sum of the measures of the two acute angles and now you know that the sum of all the angles is 540°, then, you have:


 α+α+2α+2α+2α=540°

 8α=540°

 α=540°/8

 α=67.5°


 4. Finally, the larger angle is:


 2α=2(67.5°)=135°


 5. Therefore, the answer is: 135°

6 0
2 years ago
Suppose a1=12−12,a2=23−13,a3=34−14,a4=45−15,a5=56−16. a) Find an explicit formula for an: . b) Determine whether the sequence is
lorasvet [3.4K]

I'm going to assume you meant to write fractions (because if a_n are all non-negative integers, the series would clearly diverge), so that

a_1=\dfrac12-\dfrac12

a_2=\dfrac23-\dfrac13

a_3=\dfrac34-\dfrac14

and so on.

a. If the pattern continues as above, we would have the general term

a_n=\dfrac n{n+1}-\dfrac1{n+1}=\dfrac{n-1}{n+1}

b. Note that we can write a_n as

a_n=\dfrac{n-1}{n+1}=\dfrac{n+1-2}{n+1}=1-\dfrac2{n+1}

The series diverges by comparison to the divergent series

\displaystyle\sum_{n=1}^\infty\frac1n

4 0
1 year ago
A theater wants to build movable steps that they can use to go on and off the stage. They want the steps to have enough space in
GrogVix [38]

Answer:

fdwef

Step-by-step explanation:

4 0
2 years ago
Each vertical cross-section of the triangular prism shown below is an isosceles triangle.
vova2212 [387]

Answer:

Height is 3

Step-by-step explanation:

4.24 x 4.24 x 6

Right triangle base = a + b + c

                         a^2 + 3^2  =  4.24^2

= a^2 + 9                             = 17.98

We cross out b to subtract.

                                   a^2  = 17.98 - 9

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We then square         √a^2 = √8.98

                                    a = 2.996

We round up               a = 3                                

We have found the height is 3

5 0
2 years ago
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