First you need to know that the internal angles of a triangle always equals 180°. Therefore:

15+45= 90°

Then since the angles should equal 180, you do:

180-90=90

So the missing angle equals 90°

6 0

3 years ago

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A scientist looks at bacterium and in a virus in a lab the bacterium has a diameter of 10-6 meters. The virus has a diameter of

elena55 [62]

Ok so what's the question

8 0

2 years ago

It has been estimated that a student’s final grade in a course decreases by 5 points for every 2 days absent from class. If a st

cluponka [151]

10 points, 2 times 4 equals 10 points.

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2 years ago

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Can someone please clearly and correctly work out Q19? Would appreciate it a lot! :)

DiKsa [7]

$x^{2} +10x+30$
I always start by moving the last term to the other side
$x^{2} +10x=-30$
To complete the square you take term 'b' , divide it by 2 then square it
$( \frac{10}{2} )^2$ = 25
We have to add 25 to what we have and what you do to one side you have to do to the other
$x^{2} +10x+25=-30+25$
$x^{2} +10x+25=-5$
Now we factor what is on the left side of the equation
$(x+5)^2=-5$
The last step is to move our right side of the equation back over
$(x+5)^2+5$ - which is your answer :)))

6 0

3 years ago