A bag has 5 red marbles, 6 blue marbles and 4 black marbles
so total no. of marbles = 5 + 6 + 4 = 15
now probability of picking a black marble = 4/15
after replacement again probability of picking black marble is 4/15
it is given that black marble is picked two times
so probability of picking black marble two times or picking , replacing , and then picking is 4/15*4/15 = 16/225
Answer:
21
Step-by-step explanation:
The expression Jackie came up with is:
0.75m = 15.75.
To get the value of m, we divide both sides by 0.75
0.75m = 15.75.
0.75m/0.75 = 15.75/0.75
m = 1575/75
= 21
(I) The height of the bike changes at the same rate at pieces A and B.
(A) The height of the bike changes more slowly at piece A than at piece D.
Answer:
10 and 7
Step-by-step explanation:
Let the numbers be A and B
The sum of the two numbers is 17.
That’s
A + B = 17
The difference of the numbers is 3
A - B = 3
We now have two equations
1. A + B = 17
2 . A - B = 3
Subtract equation two from equation one.
B - - B = B + B = 2B
2B = 14
Divide both sides by 2
2B/2 = 14/2
B = 7
Now substitute 7 for B into either of the equations to get A.
Using equation 1 we have
A + B = 17
A + 7 = 17
Subtract 7 from both sides
A - 7 = 17 - 7
A = 10
The numbers are 10 and 7
Answer:
x = 7
Step-by-step explanation:
13x - 1 = 90
+1 +1
13x = 91
divide 13 by both sides of the equal sign
x = 7