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2 years ago

Need help with 8 grade math please

Mathematics

1 answer:

Illusion [34]2 years ago

6 0

Answer:

Step-by-step explanation:there is 41 people who own pets in total, and 19 people that don't have a pet in total

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Evaluate each expression for the given values:

IrinaK [193]

B)-18

7(-3)+(-2(-3))+(-3)
(-21)+(-2(-3))+(-3)
(-21)+6+(-3)
(-24)+6
-18

8 0

3 years ago

The triangles below are similar. Triangle Y X Z. Side Y X is 6 centimeters, X Z is 7 centimeters, and Z Y is 3 centimeters. Tria

kotykmax [81]

Answer:

I would go with c.

Step-by-step explanation:

Hope this helped!

7 0

2 years ago

Read 2 more answers

What is the simplified form of 2n+3(n+4)

Andrews [41]

Answer:

5n + 12

Step-by-step explanation:

Perform the indicated multiplication. Then combine like terms:

2n + 3n + 12 = 5n + 12 (answer)

5 0

2 years ago

a port and a radar station are 2 mi apart on a straight shore running east and west. a ship leaves the port at noon traveling no

Rom4ik [11]

Answer:

The rate of change of the tracking angle is 0.05599 rad/sec

Step-by-step explanation:

Here the ship is traveling at 15 mi/hr north east and

Port to Radar station = 2 miles

Distance traveled by the ship in 30 minutes = 0.5 * 15 = 7.5 miles

Therefore the ship, port and radar makes a triangle with sides

2, 7.5 and x

The value of x is gotten from cosine rule as follows

x² = 2² + 7.5² - 2*2*7.5*cos(45) = 39.04

x = 6.25 miles

By sine rule we have

$\frac{sin A}{a} = \frac{sin B}{b}$

Therefore,

$\frac{sin 45}{6.25} = \frac{sin \alpha }{7.5}$

α = Angle between radar and ship α

∴ α = 58.052

Where we put

$\frac{sin 45}{6.25} = \frac{sin \alpha }{x}$ to get

$\frac{x}{6.25} = \frac{sin \alpha }{sin 45}$ and differentiate to get

$\frac{\frac{dx}{dt} }{6.25} = cos\alpha\frac{\frac{d\alpha }{dt} }{sin 45}$

$\frac{15sin45 }{6.25cos\alpha } =\frac{d\alpha }{dt} }$ = 3.208 degrees/second = 0.05599 rad/sec.

6 0

3 years ago

a) A group of 50 people are going to run a race. The top three runners earn gold, silver, and bronze medals. b) Creating a nine

rjkz [21]

a) n (No. of peoples) = 50

r (No. of prizes) = 3

p(n,r) = p (50,3)

$\begin{gathered} P(n,r)=\frac{n!}{(n-r)!} \\ P(50,3)=\frac{50!}{(50-3)!} \\ =117600 \end{gathered}$

b) n(No. of players)=14

r (No. of players for Batting)=9

$\begin{gathered} P(14,9)=\frac{14!}{(14-9)!} \\ =726485760 \end{gathered}$

c)n(Total applicants)=30

r(tester positions)=4

$\begin{gathered} P(30,4)=\frac{30!}{(30-4)!} \\ \text{ =}\frac{30!}{26!} \\ \text{ =657720} \end{gathered}$

7 0

9 months ago