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2 years ago

Add (3d+2)+(4d+9) ixl

Mathematics

2 answers:

Elodia [21]2 years ago

7 0

Answer:

7d+11

Step-by-step explanation:

Pretty much just addition.

3d+4d+2+9

(3d+2)+(4d+9) = 7d+11.

Mandarinka [93]2 years ago

7 0

7d + 11
Steps:

(3d + 2) + (4d + 9)

3d + 2 + 4d + 9

7d+ 11

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Ulleksa [173]

Answer:

a (-5,-2)

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e (5,-2)

Step-by-step explanation:

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3 years ago

One bag contains 7 red chips and 4 yellow chips. Another bag contains 2 red chips and 8 yellow chips. A chip is drawn from each

IgorC [24]

Answer:

We have 11 chips in the first bag and 4 are yellow......so the probability of drawing a yellow

Step-by-step explanation:

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3 years ago

The probability that it will rain today is 0.4, and the

Scilla [17]

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3 years ago

Christy went on a round-trip bicycle ride starting at her house. When she left, she traveled downhill at a rate of 24 kilometers

vazorg [7]

Since this is a round-trip, Christy covered the same distance in both journey.

Let the distance covered be
$d$

When she left the house, she travelled at
$24 \: kph$

We were given the average speed to be
$20 \: kph$

Meaning if we add the speed in the return journey to 24 kph and find the average , we must obtain 20 kph.

Let
$x$
be the speed in the return trip.

Then
$\frac{24 + x}{2} = 20$

We solve for x to obtain;

$24 + x = 40$

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We were also told that she took half an hour longer in the return trip.

If we let
$t$
represent the time the first journey took, then the return trip will take

$(t + 0.5) \: hours$

Now we have the following:

$First Journey$

$speed = \frac{d}{t}$

$24 = \frac{d}{t}$

$\Rightarrow d = 24t - - - (1)$

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$16 = \frac{d}{t + 0.5}$

$\Rightarrow d = 16(t + 0.5) - - - (2)$

Now let us equate the two equations to obtain,

$16(t + 0.5)= 24t$

We expand and simplify to obtain;

$16t + 8= 24t$

This implies that,

$8= 24t - 16t$

.
$8= 8t$

$t = 1$

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hours.

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3 years ago

Matthew dropped a tennis ball off the roof of 100 foot tall building. The objects height (y) is modeled by the equation below. A

Kipish [7]

Answer:

2 seconds later

Step-by-step explanation:

Since the required equation is lacking, let the equation modeled by the height be expressed as y = -16t² + 64

The ball hits the ground at y =0. Substitute y = 0 into the expression and find t;

Since y = -16t² + 64

0 = -16t² + 64

16t² = 64

t² = 64/16

t² = 4

t = ±√4

t = 2 and -2

Time cannot be negative, hence the ball hits the ground 2 seconds later.

<em>Note that the equation used was assumed. Similar solution can be applied for any given equation.</em>

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2 years ago