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rewona [7]
3 years ago
14

The price of an item has been reduced by 20%. The original price was $90. What is the price of the item now?

Mathematics
2 answers:
oksano4ka [1.4K]3 years ago
6 0

Answer:

90×20 = 1800÷100 = 18

Step-by-step explanation:

You multiply the percent and other number and divide the answer by 100.

joja [24]3 years ago
3 0

Answer:

$72

Step-by-step explanation:

20% = 0.20

90 * 0.20 = 18

90 - 18 = 72

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An astronaut on the moon throws a baseball upward. The astronaut is 6 ft 6 in tall, and the initial velocity of the ball is 40 f
weqwewe [10]

Answer:

t = 0.293 s and 14.52 s

Step-by-step explanation:

The heights of the ball in feet is given by the equation as follows :

S = -2.7t^2+40t+6.5

Where t is the number of seconds after the ball was thrown.

We need to find is the ball 18 ft above the moon's surface.

Put S = 18 ft

-2.7t^2+40t+6.5=18\\\\-2.7t^2+40t=18-6.5\\\\-2.7t^2+40t-11.5=0

It is a quadratic equation. Its solution is given by :

t=\dfrac{-40+\sqrt{40^{2\ }-4\left(-2.7\right)\left(-11.5\right)}}{2\left(-2.7\right)},\dfrac{-40-\sqrt{40^{2\ }-4\left(-2.7\right)\left(-11.5\right)}}{2\left(-2.7\right)}\\\\t=0.293\ s,14.52\ s

So, the ball is at first 0.293 s and then 14.52 s above the Moon's surface.

8 0
3 years ago
How do you do this?please help
d1i1m1o1n [39]

Answer:

10.5 ft.

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Equation: <em>C = 2πr</em>

C = <em>2π*5.25</em>

C = 10.5π ft.

7 0
3 years ago
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