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2 years ago

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There are 14 boys and x girls in a class. One boy and one girl will be selected to represent the class on the student council.ta

ylor says there are 152 different ways of chosing a boy and a gir l

1 answer:

mezya [45]2 years ago

7 0

I’m azoic get poopzoo with the. L me. Ni innovative just m
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$1,200 TV; discount 40%

aev [14]

Answer: $480

Explanation: First, change the percentage to a decimal by dividing by 100. 40/100 = .4
Then multiply .4 by the cost, $1200. .4*1200 = $480

4 0

3 years ago

Pia printed 2 maps of a walking trail. The length of the trail on the first map is 8 cm. The length of the trail on the second m

Marianna [84]

The scale factor from the first map to the second map can be determined by:

scale factor = (length of trail in first map) / (length of trail in second map)

8 cm / 6 cm = 1.33

The landmark on the first map is a triangle with side lengths of 3mm, 4mm, and 5mm.

3mm = 3 * 1.33 mm = 3.99mm
4mm = 4 * 1.33 mm = 5.32mm
5mm = 5 * 1.33 mm = 6.65mm

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2 years ago

2x+3>_7 or 2x+9>11 plzzzz help meee

damaskus [11]

Answer:

b

Step-by-step explanation:

hi I I'm the explanation

4 0

2 years ago

Element X is a radioactive isotope such that its mass decreases by 59% every day. If an experiment starts out with 390 grams of

miss Akunina [59]

Answer:

The function that represents the mass of the sample after t days is $A(t) = 390(0.41)^t$ .

The percentage rate of change per hour is of -2.46%.

Step-by-step explanation:

Exponential amount of decay:

The exponential amount of decay for an amount of a substance after t days is given by:

$A(t) = A(0)(1-r)^t$

In which A(0) is the initial amount, and r is the decay rate, as a decimal.

Element X is a radioactive isotope such that its mass decreases by 59% every day. The experiments starts out with 390 grams of Element X.

This means, respectively, that $r = 0.59, A(0) = 390$

So

$A(t) = A(0)(1-r)^t$

$A(t) = 390(1-0.59)^t$

$A(t) = 390(0.41)^t$

The function that represents the mass of the sample after t days is $A(t) = 390(0.41)^t$ .

Hourly rate of change:

Decreases by 59% every day, which means that for 24 hours, the rate of change is of -59%. So

-59%/24 = -2.46%

The percentage rate of change per hour is of -2.46%.

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2 years ago

A grain silo is in the shape of a cylinder. The area of the circular roof is 803.84 square feet. If 13,665.28 cubic feet of grai

Svetlanka [38]

Answer:

Step-by-step explanation:

8 0

3 years ago