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sammy [17]
3 years ago
6

Points!!!!!!!!!!!!!

Mathematics
2 answers:
Elodia [21]3 years ago
5 0

<span>Assuming that 2 people who will repair a refrigerator equally fast will do it twice as fast when working together: Jannete repairs 1/60 refrigerator per minute. Lisa repairs 1/40 refrigerator per minute. Togheter they repair 1/60+1/40= 1/60 + 1,5/60 = 2,5/60=5/120=1/24 refrigerator per minute thus it will take them 24 minutes</span>
Katarina [22]3 years ago
5 0
If they are working together well it already takes jannette 60 minutes and liza is 20 minutes faster since Liza is the faster one you would use her time and that would be 60 - 20 = 40 so B
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With food prices becoming a great issue in the world; wheat yields are even more important. Some of the highest yielding dry lan
Rzqust [24]

Answer:

Option E) 61.6

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 100 bushels per acre

Standard Deviation, σ = 30 bushels per acre

We assume that the distribution of yield is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

P(X>x) = 0.90

We have to find the value of x such that the probability is 0.90

P(X > x)  

P( X > x) = P( z > \displaystyle\frac{x - 100}{30})=0.90  

= 1 -P( z \leq \displaystyle\frac{x - 100}{30})=0.90  

=P( z \leq \displaystyle\frac{x - 100}{30})=0.10  

Calculation the value from standard normal table, we have,  

P(z

\displaystyle\frac{x - 100}{30} = -1.282\\x = 61.55 \approx 61.6  

Hence, the yield of 61.6 bushels per acre or more would save the seed.

7 0
3 years ago
How do you figure out 3h = 120
cestrela7 [59]

Answer:

h=40

Step-by-step explanation:

3h = 120

Divide 3 on both sides of the equation.

\frac{3h}{3}=\frac{120}{3}

h=40

5 0
2 years ago
Read 2 more answers
How do you solve this step by step?
nikklg [1K]

Answer:

-2/9

Step-by-step explanation:

first you are going to distrubute 2/5, so 2/5 times x is 2/5x and 2/5 times -2 is -4/5

next you set up the problem with those two answers which gives you:

2/5x - 4/5 = 4x

then multiply both sides of the equation by 5: 2x-4=20x

next move the constant to the right side and chnage the sign: 2x=20x+4

then combine like terms: -18x=4

after that divide both sides of the equation by -18: -2/9

so x= -2/9

7 0
2 years ago
Read 2 more answers
The height of a triangle is 2cm more than the base of the height is increased by 2cm while the base remains the same the new are
san4es73 [151]

Answer:

Remember that a triangle's area is bh/2, where

b = base

h = height

So. You start with a triangle of base b and height h, add 2 to the height, and get a triangle of area 82.5.

b(h+2)/2 = 82.5

b(h+2) = 165

What you want to do from here is test the b and h from the choices given, and figure out which b and h satisfy this.

(a) If b=13 and h=15, b(h+2) = 221 nope.

(b) If b=9 and h=11, b(h+2) = 117 nope.

(c) If b=11 and h=13, b(h+2) = 165 that's it!

Step-by-step explanation:

4 0
3 years ago
17 less than 12 times a certain number (m) IS 23 less than six times the same
REY [17]

Answer:

  m = -1

Step-by-step explanation:

12 times the number is 12m

17 less than that is 12m -17.

23 less than 6 times the number is 6m-23.

These expressions  are said to be the same:

  12m -17 = 6m -23

  6m -17 = -23 . . . . . . . . subtract 6m from both sides

  6m = -6 . . . . . . . . . . add 17 to both sides

  m = -1 . . . . . . . . . divide both sides by 6

The value of m is -1.

3 0
2 years ago
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