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vodka [1.7K]
3 years ago
7

4.Find the solution mentally.

Mathematics
2 answers:
Trava [24]3 years ago
6 0
3*-4=-12
4*-3=-12
-12*-1=12
garik1379 [7]3 years ago
3 0

Answer:

3×-4=a

a=-12

b×(-3)= -12

-3b= -12

b=-12

-12c=12

c=-1

d×24= -12

24d= -12

d= -1/2 or -0.5

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The diameter of a circle measures 14 m. What is the circumference of the circle?
sergey [27]

Answer:

Step-by-step explanation:

The circumference is either pi*d or 2 pi r

Use pi*d

3.14 * 14 = 43.96

6 0
2 years ago
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Neporo4naja [7]

Answer:

Nocomplanar? Right because they’re not all in the same place?

Step-by-step explanation:

7 0
3 years ago
0.3% of a country has a certain disease. The test for the disease has a sensitivity of 92% (i.e., of those we know have the dise
butalik [34]

Answer:

0.95988 (Accuracy of the test )

Step-by-step explanation:

To determine the accuracy of this test we have to list out the given values

Prevalence rate of the disease = 0.3% = 0.003

sensitivity rate of the disease = 92% = 0.92

specificity rate for the test = 96% = 0.96

The accuracy of the test can be found using this equation

Accuracy = sensitivity * prevalence + specificity ( 1 - prevalence )

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                = 0.00276 + 0.95712

                = 0.95988

6 0
3 years ago
A wheel with a circumference of 3 inches is rotating at 5 rotations per minute. I is the distance the wheel travels in one minut
Andreas93 [3]
So circumference is the distance around the wheel
that is the part that is actually touching the ground
so therefor the wheele travels 3 inches per rotations
5 rotations per minute
we have to find the distance
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answer is 15 in per miute
I=15
7 0
3 years ago
Number 11. I need help!!!
Westkost [7]
First add the seconds you have 45 +5+10 seconds which equals 60 seconds or 1 minutes. Now add the minutes 9 + 7 + 12 minutes = 28 minutes then add that 1 minutes that you got from the seconds 28 + 1 minute = 29 minutes 7:40 + 20 minutes = 8:00 + 9 minutes = 8:09 am. So Marsha arrived to school at 8:09 am. Comment if you have any questions.
7 0
3 years ago
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