We can solve for x in by substituting 'y=15-5x' from the second one into the first equation, because in the second equation, y has no coefficient, which will make it easier to substitute.
Answer:
<u>Same as the original:</u>
-->A 15% increase followed by a 15% decrease
--> A 25% decrease followed by a 50% increase
-->A 50% decrease followed by a 100% increase
<u>Greater than the Original:</u>
-->A 20% decrease followed by a 25% decrease
<u>Less than the Original:</u>
-->A 75% increase followed by a 50% decrease
Step-by-step explanation:
<em>Example</em><u><em>#1</em></u><em>: I did 15% increase is 15% so followed by a -15%(decrease). The sale stayed the same.</em>
<em>Example</em><u><em>#2:</em></u><em> -20%+25%=5% *greater than the original</em>
<em>Example</em><u><em>#3</em></u><em>: If the percentage came to 0%, it stayed the same(same as original.) </em>
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Hope this helps!!
Solution:
<u>Note that:</u>
- Surface area: 2(LB) + 2(BH) + 2(LH)
<u>Substitute the values given into the expression to find the surface area.</u>
- 2(7 x 10) + 2(6 x 6) + 2(6 x 10)
- => 2(70) + 2(36) + 2(60)
- => 140 + 72 + 120
- => 332 mm²
The surface area of the rectangular prism is 332 mm².
To answer this item, I assume that it is compounded yearly such that the amount of interest (I) from the given present worth (P), interest rate (i) and the number of years (n) is calculated through the equation,
I = P x (1 + i)^n - P
Substituting,
I = ($55) x (1 + 0.04)^5 - $55
I = 11.91
The answer is nearest to the first choice, $11.
