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arsen [322]
2 years ago
5

Rounding or compatible numbers to estimate the sum of 87+34=

Mathematics
2 answers:
AlladinOne [14]2 years ago
7 0
We are simplifying this so they are easier to add in your head.

87+33 is easier math to do in your head

so our new estimated number would be 120 
Sonbull [250]2 years ago
6 0
If you are just trying to estimate count 8 and 3 together but the answer is 121
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A coral reef grows 0.15 m every week. How much does it grow in 11 weeks?
Misha Larkins [42]
Coral reef = 0.15x
0.15(11) = 1.65
1 meter = 100 cm
1.65 * 100 = 165

Solution: 165 cm
3 0
2 years ago
Simplify (3a^4-2a^2+5-10)-(2a^4+4a^2+5a-2)
katrin [286]

Answer:

Step-by-step explanation:

3a^4 -2a^2 + 5 - 10 -(2a^4 +4a^2 + 5a -2)

as given.. i'm wondering if the 5 in the first group is really 5a.. hmmm

I'm guessing that it is...  soooo distribute the minus sign

= 3a^4 - 2a^2 +5a -10  -2a^4 -4a^2 -5a +2

= a^4 -6a^2 -8   :)  voila that's your answer

7 0
3 years ago
Each exterior angle of a regular polygon measures 20. How many sides does the polygon have?
Deffense [45]
We know that
The sum of exterior angles of any polygon is 360 degrees. 
Each exterior angle of a regular polygon = 360/n
 where n is the number of sides. 
<span>So
n = 360/20 = 18
</span>
the answer is the option
<span>b.18 </span>
3 0
3 years ago
Where is the circumcenter of any given triangle?
Salsk061 [2.6K]

The <em>correct answer</em> is:


B) the point of concurrency of the perpendicular bisectors of the sides of the triangle


Explanation:


The definition of circumcenter is "the point of intersection of the perpendicular bisectors of a triangle."


To construct the circumcenter, we first construct the perpendicular bisector of each side of the triangle. Once we have these three lines, we find their point of intersection; this is the circumcenter.

4 0
2 years ago
Read 2 more answers
0.009842 in scientific notation
valentinak56 [21]
<span>0.009842 in scientific notation is 9.842^-3</span>
8 0
3 years ago
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