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4 years ago

PLEASE HELP, 25 POINTS!!!!!

Mathematics

1 answer:

AveGali [126]4 years ago

4 0

Answer:

-14

cuz sqrt of -16 is -4 and sqrt of -64 is -8 but there is an - sign there so it is positive

then 3+-4 is -1 and 6+8 is 14

lastly multiply and you get negative 14

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For a field trip, 4 students rode in cars and the rest filled nine buses. How many students went in each bus if 472 students wer

Len [333]

Answer:

Step-by-step explanation:

only 4 students went in the cars. So 472-4=468.

You have 9 buses.

So 468÷9=52

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3 years ago

A NASA test rocket launch is set up so that once the rocket takes off from a landing platform,It will splash down safely in a bo

Aleonysh [2.5K]

Answer:

237.87 m/s

Step-by-step explanation:

This is a projectile question.

We use the equation for the range of a projectile since we are given the horizontal distance and angle of projection.

So, R = U²sin2θ/g where R = range, U = initial speed of rocket, θ = projection angle and g = acceleration due to gravity = 9.8 m/s².

Since it is given that the water body is 5 km away, R = 5 km = 5000 m and θ = 30°

So, making U subject of the formula, we have that

U = √(gR/sin2θ)

So, substituting the values of the variables, we have

U = √[9.8 m/s² × 5000 m/sin(2 × 30°)]

U = √[49000 m²/s²/sin60°]

U = √[49000 m²/s²/0.8660]

U = √[56,580.33 m²/s²]

U = 237.87 m/s

So the minimum speed of the rocket necessary to make sure the rocket reaches the water surface is U = 237.87 m/s

6 0

3 years ago

Roberto must make his costume for the school play. He needs a piece of fabric that is 2 and 2/3 yards long and 1 and 1/2 yards w

ratelena [41]

Answer:

4 yd².

Step-by-step explanation:

From the question given above, the following data were obtained:

Length (L) = 2⅔ yards

Width (W) = 1½ yards

Area (A) =.?

The area of the piece of fabric that Roberto needs can be obtained by using the formula for calculating the area of a rectangle. This is illustrated below:

Area (A) = Length (L) × Width (W)

A = 2⅔ × 1½

A = 8/3 × 3/2

A = 8 × ½

A = 4 yd²

Thus, the area of the piece of fabric that Roberto needs is 4 yd²

6 0

3 years ago

Choose the true statement about the graph of 3x ≥ 6.

ycow [4]

Answer:

Whats the X given for this problem? ex.... X = 6 and the problem is:

2x (>) or (<) or = to 13

substitute ( x = 6 ) in 2x and you get 12 is < 13.

5 0

3 years ago

Calculate the area, with the appropriate number of significant figures, of a rectangular room that is 14.10 m wide by 15.0 m lon

Paladinen [302]

<h3>Answer: Choice A) 212 square meters</h3>

========================================================

Explanation:

14.10 has four sig figs. The 0 at the end is significant. This measurement is accurate to the hundredths place. If the author wrote 14.1, then it would be accurate to the tenths place with three sig figs.

15.0 has three sig figs. The 0 is significant. If they wrote 15 or 15. then we'd be dealing with 2 sig figs instead; however they placed the 0 there to tell the reader "this measurement is accurate to the tenths place"

---------------------

Multiply the values given

14.10*15.0 = 211.5

Round that to three sig figs. We pick the smaller sig fig count to round to since we cannot be certain it is accurate to four sig figs. In a sense, we pick the weakest link and use that to determine rounding when it comes to multiplication and division.

This means 211.5 rounds to 212

6 0

4 years ago