if a =2 and b =3 then that would mean (2)(3)=(3)(2) so 2*3=3*2 and 2*3=6 and 3*2=6 so yes (2)(3)=(3)(2) or ab=ba
hope this helps
Proportion:
a/b = c/d
where: cross products are equal.
ad = bc
a/b = c/d
a = 4 4/9 = 28/x
b = 9 cross products
c = 28 ad = bc
d = x 4x = 9*28
4x = 252
4x/4 = 252/4
x = 63
4/9 = 28/x
4/9 = 28/63
4/9 is the simplified factor of 28/63.
28 ÷ 7 = 4
63 ÷ 7 = 9
Another solution for this is.
4/9 = 28/x
x is a denominator, we need to eliminate it. To do so, we must make x the numerator. so we multiply both side with x.
4/9 * x/1 = 28/x * x/1
4x/9 = 28
4x/9 * 9/1 = 28 * 9/1 *eliminate the denominator 9 by multiplying both sides with numerator 9.
4x = 252
4x/4 = 252/4
x = 63
The inequality would be
0.75q ≥ 0.70(q+1)
q is defined as the number of questions he answers after the first one. We are told he gets 75% of those correct; 75%=75/100=0.75. This gives us 0.75q.
Since he gains proficiency on the exercises, the total number he gets correct has to be at least 70%. This means the inequality would have the symbol greater than or equal to, as it cannot be less and have him gain proficiency.
He has already answered 1 question and answers q more; this gives us a total of q+1. Since he gains proficiency, the cutoff was 70%; 70%=70/100=0.70. This gives us the expression 0.70(q+1).
Our total inequality would then be 0.75q ≥ 0.70(q+1)
Answer:
Group 13 to group 16
Step-by-step explanation: