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Orlov [11]
3 years ago
10

Select the expression that are equivalent to 7a+4a​

Mathematics
1 answer:
TEA [102]3 years ago
3 0

Answer:

7a+4a

we add same term.

a is common for both.

First take common term out

7a+4a  = a(7 + 4) (we add same term.

           = 11a

Step-by-step explanation:

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The annual 2-mile fun-run is a traditional fund-raising event to support local arts and sciences activities. It is known that th
victus00 [196]

Answer: 0.0228

Step-by-step explanation:

Given : The  mean and the standard deviation of finish times (in minutes) for this event are respectively as :-

\mu=30\\\\\sigma=5.5

If the distribution of finish times is approximately bell-shaped and symmetric, then it must be normally distributed.

Let X be the random variable that represents the finish times for this event.

z score : z=\dfrac{x-\mu}{\sigma}

z=\dfrac{19-30}{5.5}=-2

Now, the probability of runners who finish in under 19 minutes by using standard normal distribution table :-

P(X

Hence, the approximate proportion of runners who finish in under 19 minutes = 0.0228

8 0
3 years ago
Your teacher buys a 5 pound bad of Smarties, for $12.50. What is the unit rate for Smarties.
Taya2010 [7]
So 5 pounds=12.5
divide 12.5 by 5 to get dollars per pound
$2.5 per pouind
4 0
3 years ago
Read 2 more answers
IULIUCIIL
Sav [38]

Answer: No, because P(F T) = P(F) • P(T)

Step-by-step explanation:

6 0
3 years ago
Geometry help needed!
lilavasa [31]

Answer:

13.76

Step-by-step explanation:

Area of the whole

The area of the whole = s^2 (the firgure is a square

s = 8

Area of the whole = 8^2 = 64

Area of the unshaded part

The 2 half circles = 1 whole circle

The radius of the 1/2 circle = 4 (eight has been cut in half)

Area of two half circles = 2* (pi r^2/2)

Area of two half circles = 2 * (pi 4^2/2)

area of two half circles =  16*pi

Area of the shaded area

Area of the shaded area = area of the whole - area of the unshaded area

Area of the shaded area = 64 - 16*pi

Area of the shaded area = 64 - 3.14*16 = 13.76

4 0
3 years ago
A person who is 3 m tall casts a shadow that is 6 m long. At the same time, a building
podryga [215]

Answer:

13.5 meters

Step-by-step explanation:

25 / 2 = 13.5

because if a human is 3 meters tall and cast 2 times the length of himself then if a building casts 25 meters then it should be 2 times less than its shadow.

6 0
3 years ago
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