Note the equal sign. What you do to one side, you do to the other. Isolate the a.
Add 4 to both sides
a- 4 (+4) = 15 (+4)
a = 15 + 4
a = 19
19 is your answer for a
hope this helps
Answer: length: 7cm
width:4cm
Step-by-step explanation:
Area: L × W
7×4=28
Perimeter =L±L+W+W
7+7+4+4=22
<h2>
Greetings!</h2>
Answer:

Step-by-step explanation:
You need to remember the following equation:

Where a and b is the lengths of the two sides and c is the hypotenuse.
So simply plug these values into this:

36 + 49 = h^2
36 + 49 = 85
So the hypotenuse is the square root of 85:

<h2>Hope this helps!</h2>
Answer:
20909.09 grams
Step-by-step explanation:

= 230 grams / 11 grams × 1000 grams = 20.90909... × 1000 = 20909.09 grams