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Nonamiya [84]
3 years ago
9

Need a little help plz. I think it could be 2AM but I’m not sure.

Mathematics
1 answer:
balu736 [363]3 years ago
3 0

Answer:

2 am

Step-by-step explanation:

It takes 1 hour to pour the cement.  We will be done at 8 pm

It will take 6 hours to set at 70 degrees

8+6 hours = 14

But we circle around at 12

14-12 =2

The cement will be set at 2

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How to find the area under the standard normal curve between z 1.5 and z 2.5?
alisha [4.7K]
It is possible to calculate mathematically the area under the normal curve between any two values of z.
However, tables/software have been developed to give the areas under the normal curve to the left of particular values of z.  The function is the probability of Z<z, or P(Z<z).
The area between two values z1 and z2 (where z2>z1) is therefore 
P(Z<z2)-P(Z<z1).

For example, to find the area between  z1=1.5, z2=2.5
is 
P(Z<2.5)-P(Z<1.5)
=0.99379-0.93319
=0.06060

(above values obtained by software, such as R)
For example, the value P(Z<2.5) can be calculated using
P(Z<2.5)=erf(2.5/sqrt(2))/2+1/2
where erf(x) is a mathematical function that does not have an explicit formula (calculated by summation of series, or tabulated).
8 0
3 years ago
Please help me asap!!!
Westkost [7]

Answer: immma guess that its c

super sorry if im wrong

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Evaluate the following expression 24/3+7•2-15/5+6•2
Diano4ka-milaya [45]

Answer:

31

Step-by-step explanation:

(24/3)+(7x2)-(15/5)+(6*2)

8+(7x2)-(15/5)+(6*2)

8+14-(15/5)+(6*2)

8+14-3+(6*2)

8+14-3+12

22-3+12

19+12

31


Sorry if I did my math wrong :)

6 0
3 years ago
Can someone help me with this?
LekaFEV [45]
The constant variation for the relationship being shown is 4
3 0
2 years ago
Read 2 more answers
I need help pls <br> What is angle 3
N76 [4]

Answer:

Step-by-step explanation:

4x + 6 + 3x + 21 = 8x + 7

7x + 27 = 8x + 7

-x + 27 = 7

-x = -20

x = 20

m<3= 8(20) + 7

         160 + 7 = 167

m<1= 4(20) + 6 = 80 + 6 = 86

m<2= 3(20) + 21 = 60 + 21 = 81

3 0
2 years ago
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