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Natasha_Volkova [10]

4 years ago

14

A snail is travelling at 0.4 millimetres per second. Work out the snail's speed in metres per hour. Show clear working out witho

ut a calculator

1 answer:

GrogVix [38]4 years ago

6 0

60 sec=1 min so 3600sec in a hour .4mm=0.0004meters in a hours time the snail would have moved 1440mm or
(1.44mph)

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Evaluate the expression 3a - 2ab if a = 4 and b = 6

makkiz [27]

Answer:

-36

Step-by-step explanation:

3(4)-2(4)(6)= -36

6 0

4 years ago

Ahat [919]

It would be 2x over 6

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Two college roommates have each committed to donating to charity each week for the next year. The roommates’ weekly incomes are

schepotkina [342]

Answer:

C. 5 weeks.

Step-by-step explanation:

In this question we have a random variable that is equal to the sum of two normal-distributed random variables.

If we have two random variables X and Y, both normally distributed, the sum will have this properties:

$S=X+Y\\\\\ \mu_S=\mu_X+\mu_Y=30+60=90\\\\\sigma_S=\sqrt{\sigma_X^2+\sigma_Y^2}=\sqrt{10^2+20^2}=\sqrt{100+400}=\sqrt{500}=22.36$

To calculate the expected weeks that the donation exceeds $120, first we can calculate the probability of S>120:

$z=\frac{S-\mu_S}{\sigma_S} =\frac{120-90}{22.36}=\frac{30}{22.36}=1.34\\\\P(S>120)=P(z>1.34)=0.09012$

The expected weeks can be calculated as the product of the number of weeks in the year (52) and this probability:

$E=\#weeks*P(S>120)=52*0.09012=4.68$

The nearest answer is C. 5 weeks.

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3 years ago

Jason wanted to buy postcards for his cousin. The price was 2 cards for $1. He had some change in his pocket. What combination o

Zina [86]

Answer:

2 dimes, 1 nickel and 3 quarters.

Step-by-step explanation:

The price of 2 postcards is $1. Any combination of coins that adds to $1 will work here. Remember, a penny is worth 0.01, a nickel is worth 0.05, a dime is worth 0.10, and a quarter is worth 0.25.

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8 0

4 years ago

Solve: This is for Grace Rosalia ...no one else:<br>4x + 14 = 2x + 18

ddd [48]

Answer:

x = 2

Step-by-step explanation:

Step 1: Subtract 2x from both sides.

4x+14−2x=2x+18−2x

2x+14=18

Step 2: Subtract 14 from both sides.

2x+14−14=18−14

2x=4

Step 3: Divide both sides by 2.

2x

2

=

4

2

x=2

:)

:)

:

Hope this helps!

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3 years ago

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