Let d1 and d2 be the intersection lines of planes −x+3y+z−3 = 0 and x+3y−5z−4 = 0,
2x − y + z + 1 = 0 and x + y − 3z = 0, respectively.
a) Show that whether d1 and d2 are planar. If so, find this plane.
b) Show that whether d1 and d2 are intersecting. If so, find the intersecting point.

which expression represents the approximate length of bc?

step-by-step explanation:

22 dimes and 9 nickels

step-by-step explanation:

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.  

the number of possible outcomes that do not show a 1 on the first spinner and show the number 4 on the second spinner is 2.

spinner 1 spinner 2

1                     1

1                     2

1                     3

1                     4

2                   1

2                   2

2                   3

2                   4   = not 1, and 4

3                   1

3                   2

3                   3

3                   4 = not 1, and 4

only 2 outcomes have passed the given condition.

step-by-step explanation: