Guest #3784

2 months ago

(2x-2)(x+4)=0 x=1 x=-4

Question

A ball is launched into the sky at 272 feet per second from the roof of a skyscraper 1,344 feet tall. The equation for the ballâ€™s height h at time t seconds is h = -16t2 + 272t + 1344. When will the ball strike the ground?

Solution 1

**Answer:**

** Time taken to reach the ball to the ground is 21 seconds.** Â Â Â Â Â Â Â Â Â

**Step-by-step explanation:**

**Given : **A ball is launched into the sky at 272 feet per second from the roof of a skyscraper 1,344 feet tall. The equation for the ballâ€™s height h at time t seconds is .

**To find :** When will the ball strike the ground?

**Solution : **

**The equation for the ball's height 'h' at time 't' is given by,**

**When the ball strike the ground the height of the ball became zero.**

**Substitute h=0 in the given equation,**

**Taking 16 common,**

**or **

**Solve by middle term split,**

**Reject t=-4 as time can never be negative.**

**Therefore, Time taken to reach the ball to the ground is 21 seconds.**

Solution 2

The answer is -16(t+4)(t-21)

Question

American cheese 0.45 to 4.26 what is the percent increase

Solution 1

For this case we have the following rule of three:

Â 0.45 ------> 100%

Â 4.26 ------> x

Â Clearing x we have:

Â x = (4.26 / 0.45) * (100)

Â x = 946.6666667%

Â Thus, the percentage of growth is:

Â 946.6666667 - 100 = 846.6666667

Â Rounding:

Â 846.7%

Â**Answer:**

Â**the percent increase is:**

Â**846.7%**

Â 0.45 ------> 100%

Â 4.26 ------> x

Â Clearing x we have:

Â x = (4.26 / 0.45) * (100)

Â x = 946.6666667%

Â Thus, the percentage of growth is:

Â 946.6666667 - 100 = 846.6666667

Â Rounding:

Â 846.7%

Â

Â

Â

Question

The average score on a standardized test is 750 points with a standard deviation of 50 points. What is the probability that a student scored more than 850 on the standardized test ?

Solution 1

The probability that student scored more than 850 we shall proceed as follows:

z=(x-Î¼)/Ïƒ

where:

x=850

Î¼=750

Ïƒ=50

thus

z=(850-750)/50

z=2

thus

P(x>850)=1-P(x<850)=1-P(z<2)=1-0.9772=0.0228

Answer: P(x>850)=0.0228

z=(x-Î¼)/Ïƒ

where:

x=850

Î¼=750

Ïƒ=50

thus

z=(850-750)/50

z=2

thus

P(x>850)=1-P(x<850)=1-P(z<2)=1-0.9772=0.0228

Answer: P(x>850)=0.0228

Solution 2

**Answer:**

2%

**Step-by-step explanation:**

Question

Which of the following terms correctly describes 4:1?

Solution 1

Ratio? i don't know if thats exactly what it's asking but it's a ratio

Solution 2

**Answer:**

The answer is Ratio

**Step-by-step explanation:**

Question

WHAT IS 1/3 OF 97.50

Solution 1

The answer is 32.5. You can also do 97.5 * 0.333 = 32.46 (rounded up is 32.5).

Solution 2

Ans: 32.5 because you multiply it both together.....i really dont know i used the calculator XD sorry

Question

ella wants to use the Communicative property of multiplication to help find the product 5Ã—4. What number sentence can she use?

Solution 1

Five times four equals four times five

Question

A rectangle has a width of 8 centimeters and an area of 160 square centimeters a similar rectangle has an area of 250 square centimeters. What are the dimensions of the larger rectangle?

Solution 1

I'm a bit confused and there is not a lot of information given to this.

From what I know, the dimensions of the larger rectangle can be found from length x width = 250 square centimetres.

Any multiplication problem that equals 250 could work out for length x width.

From what I know, the dimensions of the larger rectangle can be found from length x width = 250 square centimetres.

Any multiplication problem that equals 250 could work out for length x width.

Question

Which point best approximates the root of 45

Solution 1

To solve forÂ âˆš45 we shall proceed as follows:

We rewrite 45 as 3Â²Ã—5

thus

âˆš45=âˆš(3Â²Ã—5)

pulling terms out from under the radical we obtain

3âˆš5

thus the exact answer form is:

3âˆš5

or the decimal form is:

6.70820393

We rewrite 45 as 3Â²Ã—5

thus

âˆš45=âˆš(3Â²Ã—5)

pulling terms out from under the radical we obtain

3âˆš5

thus the exact answer form is:

3âˆš5

or the decimal form is:

6.70820393

Question

What is the maximum for
f(x)= 625-16x^2

Solution 1

The maximum is x=3.42

Question

Ming Ling Ching has 4 apples to the power of 12. How many apples does he/she have?

Solution 1

To find the amount of apples she has you must multiply 4x4x4x4x4x4x4x4x4x4x4x4

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