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AnnyKZ [126]
3 years ago
15

BRAINLIESTTT ASAP! PLEASE HELP ME :)

Mathematics
1 answer:
Sav [38]3 years ago
7 0

Answer:  18/5 hours, or 3.6 hours

=================================================

Work Shown:

x = amount of time it takes Blake to do the job by himself

y = amount of time it takes Ned to do the job by himself

z = time it takes if they worked together

In this case,

x = 9 and y = 6

Use those values to find z.

\frac{1}{x}+\frac{1}{y} = \frac{1}{z}\\\\\frac{1}{9}+\frac{1}{6} = \frac{1}{z}\\\\\frac{2}{18}+\frac{3}{18} = \frac{1}{z}\\\\\frac{2+3}{18} = \frac{1}{z}\\\\\frac{5}{18} = \frac{1}{z}\\\\5z = 18\\\\z = \frac{18}{5}\\\\z = 3.6\\\\

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ANTONII [103]
So the angle A on the first diamond corresponds with angle Q, angle B with angle S, angle C with angle R, and angle D with angle P. So if angle D correspond (equals) angle P then x+34=97 and if angle R corresponds with C then 3y-13=83. From there just do some basic algebra to find the x and y values. 
5 0
4 years ago
Consider triangle ABC where AB=X+5, BC=X-2, area is 30cm squared. Find X by solving X^2+3X-70=0, and find the perimeter.
klasskru [66]

Answer:

What the hell AC is not given so you can't find the Perimeter

Step-by-step explanation:

  • x^2+3x-70=0
  • (x-7)(x+10)=0
  • x-7=0

       x+10=0

  • x=7

       x=-10

AB=x+5

  • AB=12

        AB=-5

BC=x-2

  • BC=5

        BC=-12

Area of ABC = 30cm2

<u>Perimeter of ABC = AB+BC+</u><u>AC</u>

<u />

8 0
3 years ago
A subway train is traveling at a rate of 22.4 m/s. Brakes are applied and it slows down at a constant rate of 3.5 m/s2 until it
WARRIOR [948]

You use the equation Final Velocity²= (Initial Velocity)² 2(Acceleration)(Distance). You plug in what you have 0²=22.4² X 2(-3.5)(D) and solve for D which is 71.68m or about 72m.

6 0
3 years ago
What is the general rule for the arithmetic sequence? 15, 12, 9, 6, … A. 3n – 18 B. 6(3 – n) C. 3n + 12 D. 18 – 3n
slavikrds [6]
A1 = first term
a1 = 15
---------------------------------------------
d = common difference 
d = (second term) - (first term)
d = a2 - a1
d = 9-12
d = -3
The negative common difference indicates that the terms are decreasing
Each time we subtract 3, or add -3, to get the next term.
----------------------------------------------
nth term of arithmetic sequence
an = a1 + d(n-1)
an = 15 + (-3)(n-1)
an = 15- 3n + 3
an = 18 - 3n

Answer is choice D
3 0
3 years ago
(7 point)
Vladimir [108]

The number of social media post of Noami has a greater spread when compared to that of Amir.

<h3 /><h3>What is the range and intequartile range of the social media posts?</h3>

Range is the difference between the highest and lowest values of a set of observations

Range = highest value - lowest value

  • The range of Amir's social media posts = 19 - 15 = 4
  • The range of Noami's social media posts = 10 - 0 = 10

The inter quartile range is the difference between the third quartile and the first quartile of a data set.

IQR = Q3 - Q1

The IQR of Amir's social media posts: 7

The IQR of  Naomi's social media posts = 10

To learn more about range, please check: brainly.com/question/12372689

5 0
2 years ago
Read 2 more answers
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