Need this answered ASAP

Can someone please check if this is right? if it’s not can you explain.

dangina [55]

Answer:

Its true i read it all every thing was correct but i will explain you

Step-by-step explanation:

Well

Pete marble goes 1.5 feet per sec

Stphan marble 2.25 feet per sec

Sooo

As you see stephano marble will reach 6 foot mark sooner as its faster and its speed is higher

Hope this helped you

Your welcome 

<h3>Your a clever (girl / boy) </h3>

6 0

3 years ago

In order to determine if living next to high-voltage power lines increases your chance of getting cancer, researchers selected s

DIA [1.3K]

Answer:

An observational study

Explanation:

observational studies are those a study where the researcher observes the effect of a defy factor, diagnostic test, treatment or other intervention without trying to change who is or isn't exposed to it. Cohort study and control studies are of two observational studies. These are the part of fundamental of epidemiological research. These are called observational studies because the investigators observe individuals without manipulation and intervention. These studies are an important category of study design. Well, design observational studies maybe the next best method to address these types of questions.

3 0

3 years ago

Identify the conic section represented by the equation: x2 + 2x + 2y2 – 12y + 11 = 0 2

wlad13 [49]

Answer:

Equation of the Ellipse

$\frac{(x+1)^{2} }{8} + \frac{(y-3)^{2} }{4} = 1$

Step-by-step explanation:

Step(i):-

Given that the equation

x² + 2 x + 2y² - 12 y +11 = 0

⇒ x² + 2 x + 1 - 1 + 2(y² - 6 y )+ 11 = 0

x² + 2 x + 1 - 1 + 2(y² - 2(3) y+9-9 )+ 11 = 0

⇒ x² + 2 x + 1 - 1 + 2(y² - 2(3 y ) + 3²- 3² ) + 11 = 0

By using (a +b)² = a² + 2 a b + b²

(a -b)² = a² - 2 a b + b²

Step(ii):-

x² + 2 x + 1 - 1 + 2(y² - 2(3 y ) + 3²- 3² ) + 11 = 0

⇒ ( x+1)² +2( y-3 )² - 1 - 2(9) +11 =0

⇒ ( x+1)² +2( y-3 )² - 8 =0

( x+1)² +2( y-3 )² = 8

Dividing '8' on both sides , we get

$\frac{(x+1)^{2} }{8} + \frac{2(y-3)^{2} }{8} = 1$

$\frac{(x+1)^{2} }{8} + \frac{(y-3)^{2} }{4} = 1$

This equation represents the Ellipse

3 0

3 years ago

Ada buys 3 pounds 8 ounces of ham and 4 pounds 2 ounces of cheese for a party. How much ham and did she buy ?

Lesechka [4]

C) 7 pounds 10 ounces 7 5/8

3 ponds + 4 pounds = 7 pounds
8 ounces + 2 ounces = 10 ounces
16 ounces in a pound
7 pounds 10/16 ounces
reduce '10/16' to '5/8'

7 0

3 years ago

Find the projection of the vector A = î - 2ġ + k on the vector B = 4 i - 4ſ + 7k. 15. Given the vectors A = 2 i +3 ſ +6k and B =

Gwar [14]

Answer:

Part 1)

Projection of vector A on vector B equals 19 units

Part 2)

Projection of vector B' on vector A' equals 35 units

Step-by-step explanation:

For 2 vectors A and B the projection of A on B is given by the vector dot product of vector A and B

Given

$\overrightarrow{v_{a}}=\widehat{i}-2\widehat{j}+\widehat{k}$

Similarly vector B is written as

$\overrightarrow{v_{b}}=4\widehat{i}-4\widehat{j}+7\widehat{k}$

Thus the vector dot product of the 2 vectors is obtained as

$\overrightarrow{v_{a}}\cdot \overrightarrow{v_{b}}=(\widehat{i}-2\widehat{j}+\widehat{k})\cdot (4\widehat{i}-4\widehat{j}+7\widehat{k})\\\\\overrightarrow{v_{a}}\cdot \overrightarrow{v_{b}}=1\cdot 4+2\cdot 4+1\cdot 7=19$

Part 2)

Given vector A' as

$\overrightarrow{v_{a'}}=2\widehat{i}+3\widehat{j}+6\widehat{k}$

Similarly vector B' is written as

$\overrightarrow{v_{b'}}=\widehat{i}+5\widehat{j}+3\widehat{k}$

Thus the vector dot product of the 2 vectors is obtained as

$\overrightarrow{v_{b'}}\cdot \overrightarrow{v_{a'}}=(\widehat{i}+5\widehat{j}+3\widehat{k})\cdot (2\widehat{i}+3\widehat{j}+6\widehat{k})\\\\\overrightarrow{v_{a'}}\cdot \overrightarrow{v_{b'}}=1\cdot 2+5\cdot 3+3\cdot 6=35$

7 0

4 years ago