A = L * W
A = 357
W = 17
357 = 17L
357 / 17 = L
21 = L <== length is 21 inches
Step-by-step explanation:
<em>Look at the picture</em>
a. 5pk → 5
b. f = 1f → 1
c. -9t → -9
d. -j = -1j → -1
Answer:
Ella incorrectly combined the r coefficients. The correctly simplified expression is b Plus 3r.
Step-by-step explanation:
(3b+4r)+(-2b-r)
Open the bracket
=3b+4r-2b-r
Combine the like coefficient
=3b-2b+4r-r
=b+3r
Ella incorrectly combined the r coefficients. The correctly simplified expression is b Plus 3r.
Mean = Sum of all the observations/ Number of observations = (87+46+90+78+89)/5 = 78
Variance = SD^2 ------ SD = Standard deviation
It means that with Variance, square root is never taken.
Therefore,
Variance = Summation of square of differences between observation and the mean divided by the number of observations.
That is,
Variance = {(87-78)^2 + (46-78)^2 + (90-78)^2 + (78-78)^2 + (89-78)^2}/5 = 274
Answer: sin pi/4 sin pi/6 = 1/2(cos pi/12 - cos 5pi/12)
correct on apex
