Answer:
Jewel is 7 years old
John is 1 year old
Dave is 17 years old
Step-by-step explanation:
From the question we are told that:
Jewel age is 
John age 
Dave's age a Year ago

So that Dave.s age this Year could be

Simplifying Equation for Dave's age we have





Dave is 17 years old
Therefore
Johns age is



John is 1 year old
Answer:

Step-by-step explanation:
Given: 
To find: c
Solution:
At
:
(i)
At
:
(ii)
At
:
(iii)
On subtracting (i) and (ii),
(iv)
On subtracting (i) and (iii),

On subtracting (iv) and (v),

Put a=3 in (iv)

Put
in (iii)

Answer:
5 dollars per hour
Step-by-step explanation:
first equation is line B the second one C the third one is A
Answer:
345 ft squared
Step-by-step explanation:
You can split the polygon into two rectangles. The first rectangle has a length of 25 and a height of 11 which makes an area of 275. The second rectangle has a length of 10 and a height of 7 which makes an area of 70. Then you add these two areas together and you get 345.