1.) -21
2.) 5
3.) -20
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Try the suggested solution (three of four tasks), answers are marked with colour, short explanation is given with colour text.
Let
a------------> first number
b------------> second number
we know that
a+b=-7--------> a=-7-b----------> equation 1
a-b=14--------> equation 2
<span>I substitute 1 in 2
</span>
(-7-b)-b=14-------------> -7-b-b=14----------> -7-2b=14-------> 2b=-7-14
2b=-21---------> b=-10.5
a=-7-b-------> a=-7-(-10.5)-----> a=-7+10.5------> a=3.5
the answer is
the two numbers are
a=3.5
and
b=-10.5
Step-by-step explanation:
a) p=1-p(not chosen)
1-(9/10x9/10)
=1-81/100
= <u>19/100</u>
B) p(chosen)=p(chosen/not chosen)+(not chosen/chosen)
Meaning that 1/10x9/9+ 9/10x1/9
=9/90+9/90
=<u>1</u><u>8</u><u>/</u><u>9</u><u>0</u>