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ale4655 [162]
3 years ago
10

Maris has 1,400 minutes to use on her cell phone. She has used 45% of her minutes. How many minutes has she used?

Mathematics
2 answers:
KiRa [710]3 years ago
7 0

Answer:

630 minutes

Step-by-step explanation:

.45 (percentage) multipled by the total number of minutes she has (1,400) equals 630.

nevsk [136]3 years ago
7 0

Answer:

The answer is 630.

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Suppose an astronaut can jump vertically with an initial velocity of 5 m/s. The time that it takes him to touch the ground is gi
Vitek1552 [10]

Answer:

t=1.020s

Step-by-step explanation:

Given Equation:

5t-0.5at^{2} =0

Actually the given equation is the 2nd equation of motion

i.e. S =V_{i} t+0.5at^{2}

where S=0 because the astronaut jumps on the earth

and initial velocity V_{i}=5

to find time t, put the given value of a=9.8m/s^{2} in the given equation, we get

5t-0.5(9.8)t^{2} =0\\t(5-4.9t)=0\\ \ dividing\ both\ sides\ by\ t\ we \ get\\ 5-4.9t=0\\4.9t=5\\t=\frac{5}{4.9}\\ t=1.020s

it will take t=1.020s to reach the ground if he jumps on the Earth

3 0
3 years ago
Greg has four different colored cards in a box. Yellow, red, blue, and green. He randomly selects one card, records the color, a
Veronika [31]

Answer:

He should expect to select 75 yellow cards.

Step-by-step explanation:

Since there is replacement, for each trial, we have:

1 yellow card

1 red card

1 blue card

1 green card.

If Greg does this 300 times, how many yellow cards should he expect to select?

Each trial, there are 4 cards, one of which is yellow. So 1/4 = 0.25 probability of selecting a yellow card.

Over 300 trials

0.25*300 = 75

He should expect to select 75 yellow cards.

6 0
3 years ago
How can I solve this ?
Nostrana [21]
Multiply 2,500 by 1.50 which is B.
3 0
3 years ago
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Two trains leave stations 306 miles apart at the same time and travel toward each other. one train travels at 75 miles per hour
Sindrei [870]
Combined speed = 95+75= 170 mph

they will meet in 306/170  =  1.8 hours  or 1 hour 48 minutes.
5 0
3 years ago
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Solve for X. Round to the nearest tenth of a degree, if necessary.
DerKrebs [107]
The answer is x=52.6
5 0
3 years ago
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