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3 years ago

10

If a dental patient is charged $65.97 for teeth cleaning, $127.12 for X-rays, and $94.50 for a dental exam, what should his tota

l bill be for the procedures

1 answer:

maks197457 [2]3 years ago

4 0

The total should be 287.59. You add the numbers (127.12+94.50+65.97) and it should equal to that.

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Nine increased by the product of a number and 2 is less than or equal to 27.

Naily [24]

Answer:

x≤9

Step-by-step explanation:

9+2x≤27

1) Subtract both sides by 9:

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2) Divide both sides by 2:

x≤9

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If a train travels for 4.5 hours at a rate of 40 mph, what is the distance the train will travel?

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3 years ago

Help me please!! i am already failing the test

Ivan

Answer:

2x²+2x

Step-by-step explanation:

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4 0

3 years ago

A projectile is launched into the air. The function h(t) = –16t2 + 32t + 128 gives the height, h, in feet, of the projectile t s

Zinaida [17]

Answer:

t = 4 seconds

Step-by-step explanation:

The height of the projectile after it is launched is given by the function :

$h(t)=-16t^2+32t+128$

t is time in seconds

We need to find after how many seconds will the projectile land back on the ground. When it land, h(t)=0

So,

$-16t^2+32t+128=0$

The above is a quadratic equation. It can be solved by the formula as follows :

$t=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}$

Here, a = -16, b = 32 and c = 128

$t=\dfrac{-32\pm \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=\dfrac{-32+ \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}, \dfrac{-32\- \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=-2\ s\ \text{and}\ 4\ s$

Neglecting negative value, the projectile will land after 4 seconds.

4 0

3 years ago