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3 years ago

84 people take a driving test.

1 answer:

4 0

Answer: The probability that you select a women who passes is 1/2.

First, let's look at the men. 21 of the 84 test takers were men. If the ratio is 5:2 for failing. Then, 15 failed and 6 passes.

Second, let's look at the women. 63 of the test takers were women. If double the number passed, then 42 passed and 21 failed.

The chances that a random person was a women who passes is 42 out of 84 or 1/2.

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If a bacteria population starts with 80 bacteria and doubles every four hours, then the number of bacteria after t hours is n =

Over [174]

Answer:

Step-by-step explanation:

given that a bacteria population starts with 80 bacteria and doubles every four hours,

The function representing the number of bacteria after t hours

= $n=f(t) = 80*2^{\frac{t}{4} }$

We are to find the inverse of the function

i.e. we must make t = g(n) where g is a function of n.

Take log on both sides.

$ln n =ln80+\frac{t}{4} ln 2\\\frac{t}{4} =\frac{ln\frac{n}{80} }{ln 2} \\t = 4\frac{ln\frac{n}{80} }{ln 2}$

this is the inverse function.

8 0

3 years ago

Jeremy has $120 in his saving account. Katie had $180 in her account. Each week Jeremy adds $14.00 to his account and Katie adds

valkas [14]

Answer:

15 weeks

Step-by-step explanation:

Let the number of weeks = x.

At the end of x weeks,

Jeremy has 120 + 14x,

and Katie has 180 + 10x

We want to know when their amounts are equal.

120 + 14x = 180 + 10x

4x = 60

x = 15

Answer: 15 weeks

8 0

2 years ago

Read 2 more answers

Sally can paint a room in 8 hours while it takes steve 7 hours to paint the same room. how long would it take them to paint the

77julia77 [94]

Rate for Sally is 1 room per 8hrs
rate for Steve is 1 room per 7hrs

combined rate:
1/8 + 1/7 = 1/T
7/56 + 8/56 = 1/T
15/56 = 1/T
56/15 = T
3 11/15 = 3 hrs 44 min

3 0

3 years ago

Graph the following inequality. Click on the graph until the correct one appears.

exis [7]

Answer: Its the first one

You draw the graph of the line y=3x+5

but make the line dotted.

Label the line y>3x+5

Note that if instead we hade y≥3x+5 the line would be solid.

If you draw a line parallel to the y-axis through any x-value the value of y can be any on that vertical line that is above but not on the line y=3x+5

. So you end up with a 'feasible' region of solutions for y

5 0

3 years ago

Can someone help please?

natima [27]

Question 4 is C and im not sure about the other questions

8 0

3 years ago