Answer:
Yes, area units are squared (and volume units are cubed). The answers are:
- a. 7.5 in
- b. 12 in
- c. 16.5 in
Step-by-step explanation:
Finding the area of a square or rectangle just involves multiplying the measures of both sides. So to find the measures of the missing sides, you need to divide the given area by the given side.
(Area)/(Known side)=(Unknown Side)
The units get squared because they're being multiplied... I'm not really sure how else to put it so sorry if it's still weird. It's like (x)(x)=x² but with the units; which are inches in this case.
The units pretty much always follow mathematical rules if your keeping track of them. Multiplying like units results in squared (for areas) or cubed (for volumes) units and dividing units gives you a ratio (like miles/hour). Adding and subtracting them won't change their degrees, but you also can't mix unlike unit degrees (in+in² can't be performed). Units will reduce if you divide or multiply them in certain ways too(miles/hour multiplied by hours will give you just the miles); but I digress.
+ means: More than, Add, In Addition, Increased, In Excess, Greater.
<span>- means: Decreased by, Less than, Subtract, Difference, Diminished, </span>
<span>........Reduced, Remainder. </span>
<span>• or x means: Times as much, Percent of, Multiply, Product, Interest on. </span>
<span>/ or ÷ means: Divide, Quotient, Per. </span>
<span>(...) means: Quantity. </span>
<span>= means: Is, Was, Equal, Will be, Results.</span>
Answer:
D
Step-by-step explanation:
(-1) + (-1) = -2... so 500 times... it would be -500.
Answer: The equation is f(x) = 
;
The piece of plastic has to have 10mm of thickness.
Step-by-step explanation: It is known that with 1 mm of thickness, 5% of the intensity is reduced. So, 95% of the light is transmitted.
For each milimetre added, "more" 95% of light is transmitted.
For example, if another milimetre of plastic is added, another 0.95 of light is transmitted:
0.95.0.95 = 0.9025 of light reach the visor
So, the model that relate thickness of plastic and intensity of light is:
f(x) =
in which:
f(x) is the intensity of light;
x is thickness in mm;
Using the equation, the thickness necessary to reduce intensity to 60% is:
f(x) =
0.6 =
log 0.6 = log
x. log (0.95) = log (0.6)
x = 
x = 9.95
x ≈ 10
The thickness necessary to reduce intensity of light to 60% is 10mm.
