Step-by-step explanation:
let the numbers x and y
so x + y =13
x - y = 5
add two equations together
2x = 18
divide both side by 2
x = 9
sub in any equation
9 + y =13
y = 4
the numbers are 9 and 4
Answer:
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Step-by-step explanation:
Answer:
b
Step-by-step explanation:
Answer:

Step-by-step explanation:
From the question we are told that:
Height of child 
Height of child's shadow 
Height of tree's shadow
Since position of Sun remains constant
Generally the equation for Height of tree h_t mathematically given by



Answer:
3/10 or 30%
Step-by-step explanation:
Add all of the marbles: 5+2+3=10
Then use a fraction to represent the three purple marbles: 3/10
That porportion is your answer