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Vadim26 [7]
2 years ago
15

50.4 is what percent of 280

Mathematics
1 answer:
shusha [124]2 years ago
5 0
Us the is over of method
50.4•100=5,040
5,040/280=x
X= 18
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Alexxx [7]

ANSWER

Step-by-step explanation:

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5 0
2 years ago
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Jamie ran 1/5 of a relay. She ran 3/4 of a mile. How long was the relay?
topjm [15]
 (1/5) times (the relay)  =  3/4 mile

Multiply each side by 5
The relay = (5) x (3/4) = 15/4 = <span>3.75 miles.</span>
4 0
3 years ago
Solve the inequality.
borishaifa [10]
2>8-4h/3  subtract 8 from both sides

-6>-4h/3  multiply both sides by 3

-18>-4h  divide both sides by -4 (and reverse sign because of division by a negative value)

4.5<h or by convention...

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8 0
3 years ago
. A box in a certain supply room contains four 40-W lightbulbs, five 60-W bulbs, and six 75-W bulbs. Suppose that three bulbs ar
yaroslaw [1]

Answer:

a) 59.34%

b) 44.82%

c) 26.37%

d) 4.19%

Step-by-step explanation:

(a)

There are in total <em>4+5+6 = 15 bulbs</em>. If we want to select 3 randomly there are  K ways of doing this, where K is the<em> combination of 15 elements taken 3 at a time </em>

K=\binom{15}{3}=\frac{15!}{3!(15-3)!}=\frac{15!}{3!12!}=\frac{15.14.13}{6}=455

As there are 9 non 75-W bulbs, by the fundamental rule of counting, there are 6*5*9 = 270 ways of selecting 3 bulbs with exactly two 75-W bulbs.

So, the probability of selecting exactly 2 bulbs of 75 W is

\frac{270}{455}=0.5934=59.34\%

(b)

The probability of selecting three 40-W bulbs is

\frac{4*3*2}{455}=0.0527=5.27\%

The probability of selecting three 60-W bulbs is

\frac{5*4*3}{455}=0.1318=13.18\%

The probability of selecting three 75-W bulbs is

\frac{6*5*4}{455}=0.2637=26.37\%

Since <em>the events are disjoint</em>, the probability of taking 3 bulbs of the same kind is the sum 0.0527+0.1318+0.2637 = 0.4482 = 44.82%

(c)

There are 6*5*4 ways of selecting one bulb of each type, so the probability of selecting 3 bulbs of each type is

\frac{6*5*4}{455}=0.2637=26.37\%

(d)

The probability that it is necessary to examine at least six bulbs until a 75-W bulb is found, <em>supposing there is no replacement</em>, is the same as the probability of taking 5 bulbs one after another without replacement and none of them is 75-W.

As there are 15 bulbs and 9 of them are not 75-W, the probability a non 75-W bulb is \frac{9}{15}=0.6

Since there are no replacement, the probability of taking a second non 75-W bulb is now \frac{8}{14}=0.5714

Following this procedure 5 times, we find the probabilities

\frac{9}{15},\frac{8}{14},\frac{7}{13},\frac{6}{12},\frac{5}{11}

which are

0.6, 0.5714, 0.5384, 0.5, 0.4545

As the events are independent, the probability of choosing 5 non 75-W bulbs is the product

0.6*0.5714*0.5384*0.5*0.4545 = 0.0419 = 4.19%

3 0
3 years ago
michael basketball team practice fir 2 hours and 40 minutes yesturday and 3 hours 15 minutes today.how much longer did team prac
Serjik [45]

Answer:

35 minutes

Step-by-step explanation:

2 hrs 4 min= 160 min

3 hrs 15 min= 195 min

195-160=35

6 0
3 years ago
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