Answer:
CBD =31
Step-by-step explanation:
CBD + DBE equal 90 since together they form a right angle
CBD + 59 = 90
Subtract 59 from each side
CBD +59-59 = 90-59
CBD =31
Answer:
57
Step-by-step explanation:
Average = total points / total students
95 = (19×97 + x) / 20
1900 = 1843 + x
x = 57
The lowest the last test score can be for the whole class to average a 95 is 57.
Answer:
x=1 y=2
Step-by-step explanation:
Isolate x for 4x -y =2: x=2+y/4
Substitute x= 2+y/4
(2+13y/4) +3y=7
simplify 2+13y/4) =7
Isolate y for 2+13y/4) =7: y=2
Forx= 2+y/4
Substitute y =2
x=2+2/4
x=1
Answer:
4
Step-by-step explanation:
The mean is the average of a data set. It can be found by adding up all of the values in a data set and then dividing it by the number of values in the data set.
The values in this data set;
![7,5,5,3,2,2](https://tex.z-dn.net/?f=7%2C5%2C5%2C3%2C2%2C2)
The number of values in this data set,
![6](https://tex.z-dn.net/?f=6)
Find the mean;
![\frac{sum\ of\ vlaues}{number\ of\ values}](https://tex.z-dn.net/?f=%5Cfrac%7Bsum%5C%20of%5C%20vlaues%7D%7Bnumber%5C%20of%5C%20values%7D)
![=\frac{7+5+5+3+2+2}{6}\\\\=\frac{24}{6}\\\\=4](https://tex.z-dn.net/?f=%3D%5Cfrac%7B7%2B5%2B5%2B3%2B2%2B2%7D%7B6%7D%5C%5C%5C%5C%3D%5Cfrac%7B24%7D%7B6%7D%5C%5C%5C%5C%3D4)
Answer:
complementary angles sum to 90° 90° - 70° = 20° complementary of 70° is 20°