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3 years ago

15

A math teacher gave her students two tests. On the first test, 80% of the class passed the test, but only 30% of the class passe

d both tests.
What is the probability that a student passes the second test, given that they passed the first one?

1 answer:

geniusboy [140]3 years ago

6 0

55% because you add 80% and 30% which is 110% and divide that by 2.

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Two lines intersect to form a linear pair with equal measures. One angle has the measure 6x° and the other angle has the measure

Ronch [10]

Answer:

The answer to your question is: x = 15 and y = 17

Step-by-step explanation:

∠A = 6x

∠B = 9y - 63

they are linear pair, their addition gives 180°

but it also mention that linear pair with equal measure, so each angle measures 90°

6x = 90

x = 90/6

x = 15

9y - 63 = 90

9y = 90 + 63

9y = 153

y = 153/9

y = 17

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3 years ago

Billy has a gallon of paint. He us going to pour it into a paint tray that measures 10 inches wide, 14 inches long and 4cm deep.

erica [24]

Answer:

Tray will overflow with $10.53\ \text{inch}^3$ of paint.

Step-by-step explanation:

Dimensions the tray is 10 inch by 14 inch by 4 cm

$1\ \text{cm}=\dfrac{1}{2.54}\ \text{inch}$

$4\ \text{cm}=\dfrac{4}{2.54}\ \text{inch}$

Volume the tray can hold is

$10\times 14\times \dfrac{4}{2.54}\ \text{in}^3$

$1\ \text{inch}^3=\dfrac{1}{231}\ \text{gallon}$

The volume of paint Billy has is $1\ \text{gallon}$

Difference in the volume of paint and volume of tray in cubic inches is

$\left(1-\dfrac{10\times14\times\dfrac{4}{2.54}}{231}\right)231=10.53\ \text{inch}^3$

The tray will overflow with $10.53\ \text{inch}^3$ of paint.

3 0

2 years ago

How many years will it take a major hamburger fast food chain to sell 45,000,000 burgers if it sells approximately 12,350 burger

TEA [102]

$1 day.....12,350 b \\ x...........45,000,000b \\\\ x=\frac{1*45,000,000}{12,350} \\\\ x=3,643.7 :365 \ (days) \\\\ x=9,98 \ days \\\\ \boxed{x=9,98\approx 10 \ years}$

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3 years ago

Read 2 more answers

g On any day, the probability of rain is 0.3. The occurrence of rain on any day is independent of the occurrence of rain on any

Ksju [112]

Answer:

0.249579

Step-by-step explanation:

P(rain) = 0.3

P(no rain) = 1 - 0.3 = 0.7

The event of rain falling a second time within the next 5 days is possible in these ways

1. Rain on days 1 and 2

2. Rain on days 1 and 3; none on day 2

3. Rain on days 1 and 4; none on days 2 and 3

4. Rain on days 1 and 5; none on days 2, 3 and 4

5. Rain on days 1 and 6; none on day 2, 3, 4 and 5

$P(\text{second rain within 5 days}) = 0.3^2+0.3^2\times0.7+0.3^2\times0.7^2+0.3^2\times0.7^3+0.3^2\times0.7^4 = 0.3^2(1+0.7+0.7^2+0.7^3+0.7^4)= 0.09\times2.7731=0.249579$

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3 years ago

Find the area of a traingle given that the base is 19.5cm and height is 8 4/5cm.

Phoenix [80]

Answer:

85.6cm

Step-by-step explanation:

Area of a triangle =1/2*b*h

Where base=19.5cm while the height is 8 4/5 = 8.8

Area = 1/2 * 19.5cm * 8.8cm

Area = 171.6cm/2

Area=85.6cm

3 0

3 years ago