The ratio of cars to trucks is 9 to 4. If 4 there are 52 trucks, what is the number of cars? Explain how you got your answer

117 cars.

Step-by-step explanation:

Hi Yirod!

To begin, we need to find out what 52 ÷ 4 is. That's because there are 4 trucks in the ratio, but a total of 52 trucks.

52 ÷ 4 = 13

So we're multiplying everything by 13.

9 × 13 = 117

So there are cars.

Check:

Since we have 52:117, it should simplify to 9:4

52:117 (divide both by 13)

9 : 4. Thus, we are correct!

n

step-by-step explanation:

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560