Answer:
7/40
Step-by-step explanation:
There are 3 girls+9 boys = 12 students in the 7th grade
P (girl in 7th grade) = girls/ total
= 3/12 = 1/4
There are 7 girls+3 boys = 10 students in the 8th grade
P (girl in 8th grade) = girls/ total
= 7/10
P(7th grade girl, 8th grade girl) = 1/4 * 7/10 = 7/40
Answer:
y = (1/2)x - 3
Step-by-step explanation:
The slope of line WX is -2. Therefore, the slope of a line perpendicular to line WX is the negative reciprocal of -2, or +1/2.
Substitute -2 for y, -1 for x and 1/2 for m in y = mx + b, for the purpose of finding b:
-2 = (1/2)(-1) + b. Multiply all terms by 2 to eliminate the fraction:
-4 = -1 + b. Then b = -3, and the desired equation is y = (1/2)x - 3.
X+1825=y^2
sqrt（1825）=42.8
so the least is y^2=43^2=1849
so x=1849-1825=24
Hi
48x+8 is equivalent to 8(6x+1).
Because if you multiply the term 8 for those inside the parentheses will get the same result
8(6x-1) = 48x-8
or
(4*12x)+(4*4) = 48x+16
