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2 years ago

A survey found that 85% of people use

Mathematics

1 answer:

Jobisdone [24]2 years ago

8 0

0.85 * 2450 = 2082.5. Rounding up, about 2083 students use emoticons at Washington Middle School. Hope this helps!

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If a projectile is launched vertically upward from 800 ft above the ground with an initial velocity of 80 ft per second, its hei

tiny-mole [99]

Hello!

10 seconds to return to the ground.

7 seconds to reach 576 feet above the ground.

Find the amount of time taken to reach the ground by setting the equation equal to 0:

0 = -16t² + 80t + 800

Factor out -16 from the equation:

0 = -16(t² - 5t - 50)

Factor the terms inside of the parenthesis:

0 = -16(t - 10)(t + 5)

Find the zeros:

t - 10 = 0

t = 10

t + 5 = 0

t = -5

Time can only be positive in this instance, so the correct answer is 10 sec.

Find the time by substituting in 576 for the height:

576 = -16t² + 80t + 800

Subtract 800 from both sides:

-224 = -16t² + 80t

Rearrange:

0 = -16t² + 80t + 224

Simplify:

0 = -16(t² - 5t - 14)

0 = -16(t - 7)(t + 2)

t = 7 seconds.

8 0

3 years ago

The angle measure in degrees that corresponds to 7/10ths of a circle is what?

Serggg [28]

7/10 of the degrees of a circle is 252 . I dont know the second part of the question sorry.

8 0

3 years ago

X-31=46 explain how u got it plz i need help

mrs_skeptik [129]

Answer:

x=77

Step-by-step explanation:

77-31=46

8 0

2 years ago

Read 2 more answers

A bird caught a fish on the waters surface and flew in a stralght line diagonal to the water for 100 yards. Then, it dropped the

Masja [62]

Answer:

60 86.6

Step-by-step explanation:

Plato

3 0

3 years ago

Read 2 more answers

Your lab develops a synthetic compound that is extremely light but very durable. You test it by making a solid ball with a radiu

Maksim231197 [3]

The volume of a spherical shaped object is given by

$V= \frac{4}{3} \pi r^3$

Given that the <span>solid ball has a radius of 20.0 millimeters, the volume of the solid ball is given by

$V= \frac{4}{3} \pi(20)^3\approx33,510mm^3$

Therefore, the </span><span>closest to the volume of the synthetic compound ball, in cubic millimeters is 33,500 cubic milimeters.</span>

6 0

3 years ago