Percent means parts out of 100
15%=15/100=0.15
'of' means multiply
therefor
15% of x equals 12 means
0.15 times x=12
divide both sides by 0.15
x=80
the number is 80
1.
tan(theta)947 theta = arc tan(947) theta = 1.56974
3.
3 cos(theta)=0.714 3 cos(theta)/3=0.714/3 theta = arc cos(0.238) theta = 1.33049
5.
tan(5(theta))+7 = -0.241 tan(5(theta)) = -7.241 5(theta) = arc tan(-7.241) theta = -1.433562/5 theta = -0.286712
Answer:
Step-by-step explanation:
Given
See attachment for illustration
Required
Find x
To do this, we apply Pythagoras theorem.
From the attachment, the length of the hypotenuse is 16.7ft
While the length of the opposite/adjacent is 8.9ft
Length x is calculated using:
Take square roots
She will be using 2/5 of 8.75 gallons.
" of " means multiply
2/5 * 8.75 = 17.5 / 5 = 3.5 <== she will use 3.5 gallons
