Andrew was making a science project for school. He worked for 6.6 hours the first week, 2.75 hours the second week, and 4.4 hours the third week. Andrew used the following mental math strategy to find the total number of hours he worked on his project.

6
.
6
+
2
.
75
+
4
.
4
(
6
.
6
+
4
.
4
)
+
2
.
75

11
+
2
.
75
=
13
.
75

What is the reason for his strategy?

A.
It is easier to add decimals in a decreasing order than in a mixed order.

B.
6.6 and 4.4 are compatible numbers that are easy to add mentally.

C.
It is easier to add decimals with the same number of place values after the decimal point than adding decimals with different numbers of place values after the decimal point..

D.
Rounding removes the decimals and creates whole numbers.

(1, –1), (16, –4), (36, –6)

step-by-step explanation:

given that the function is

this can also be written as

we have to graph this function and check which list of points lie on the graph

see attachment for graph:

we find that the points lying are (1,-1) (16,-4) and (36,-6)

since square root is there we find that x can only be posiitve but y can be since square root both positive and negative.

the answer is d

step-by-step explanation:

you can also use mathway to get you answer + steps

a mantle plume is an upwelling of abnormally hot rock within the earth's mantle. as the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.

step-by-step explanation: