Answer:
Step-by-step explanation:
Sin(30) / X = Sin(45) / 12
use algebra to isolate X
1 / X = [ Sin(45) / 12 ] / Sin(30)
flip both sides
X = Sin(30) / [Sin(45) /12 ]
invert the denominator on the right side
X = Sin(30) * 12/ Sin(45)
Do you know what Sin(30) is off the top of your head?
and also Sin(45) ?
these are worth remembering... and you can b/c they are just
sin(0) = 0/2
sin(30) = 1 / 2
sin(45) = /2
sin(60)= / 2
sin(90) = / 2 (aka 1)
note the numerators just counts up 0, 1, 2, 3, 4 :)
Cos works the same way but counts from 90° back to 0 but exactly like sin other wise, hence why Cos and Sin both = /2 at 45 °
anyway
X = 1 / 2 * 12/ /2
X = 3
A=3
B= 2
:) nice , huh
Answer:
12427
Step-by-step explanation:
we know that
1 gal = 3.7854 liters
<u>
Convert 38 l of gasoline to gallon
</u>
by proportion
<u>Find the cost</u>
we know that
The gas costs $2.09 per gallon
so
Multiply $2.09 by the total of gallons
$2.09*10.04=$20.98
therefore
<u>the answer is</u>
$20.98
Answer:
simplified:
Step-by-step explanation:
- Add the number of marbles (12)
- make a fraction with the number of of blue marbles as the numerator and the total number of marbles as the denominator