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melamori03 [73]
3 years ago
13

Heeeeeeeeelp plissee!!!

Mathematics
2 answers:
Lana71 [14]3 years ago
8 0
C C A hope I helped have a nice day
taurus [48]3 years ago
5 0
8. C

9. C

10. A

Hope this helped!
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A boat travels upstream for 48 miles in 3 hours and returns in 2 hours traveling downstream in a river. What is the rate of the
alekssr [168]

Answer:

20 mph and 4 mph

Step-by-step explanation:

GIVEN: A boat travels upstream for 48 miles in 3 hours and returns in 2 hours traveling downstream in a river.

TO FIND: What is the rate of the boat in still water and the rate of the current.

SOLUTION:

Let the speed of boat in still water be s and speed of current be a.

\therefore speed of water in upstream =s+a

  speed of water in downstream =s-a

As  speed=\frac{distance}{time}

s+a=\frac{48}{3}=16

s-a=\frac{48}{2}=24

Solving both we get

s=20\text{ mph}

a=4\text{ mph}

Hence speed of boat in still water and rate of current is 20mph and 4mph respectively.

3 0
3 years ago
An airplane left Miami, FL. At the same time another plane left Santiago, Chile. The two planes flew toward each other at rates
Zinaida [17]

Answer:

3.5

Step-by-step explanation:

First we use the concept of relative speed.

The rates of the 2 planes are 625 mph & 575 mph. 

Relative speed will be:

(speed of plane A)+(speed of plane B)

=625+575

=1,200 mph

Distance=4200 miles

Thus the time taken for them to meet will be:

Time=distance/speed

=4200/1200

=3.5 hours

We therefore conclude that the planes met after 3.5 hours.

Hope this helps!

6 0
3 years ago
Read 2 more answers
What is the length of ab and bc ? a= (1,-3) b= (3,-1) C= (5,-3)
ddd [48]

Answer:

the length is (1,3

Step-by-step explanation:

the length is 3,1

5 0
3 years ago
At what speed would Mack have to drive to complete 550 miles in 12 hours if he takes a 20-minute rest break after 3 hours of dri
Maurinko [17]

12/3 is 4 breaks 12x60 is 720mins at most with 4x20= 80 = 720-80=640/ 60 means we have 10.67 hours left 550/10.67= 51.55 mph

4 0
3 years ago
Find the value of the trig functions indicated .
lara31 [8.8K]

Answer:

The choice; B) 5/3

Step-by-step explanation:

{a}^{2}  +  {b}^{2}  =  {c}^{2}  \\  {15}^{2}  +  {20}^{2}  =  {c}^{2}  \\ 225 + 400 =  {c}^{2}  \\  {c}^{2}  = 625 \\ c = 25

\sec(θ)  =  \frac{1}{ \cos(θ) }  \\  \\  \sec(θ)  =  \frac{1}{ \frac{adjacent}{hypotenuse} }  =   \frac{hypotenuse}{adjacent}  \\  \\  \sec(θ)  =  \frac{25}{15}  =  \frac{25 \div 5}{15\div 5}  =  \frac{5}{3}

4 0
1 year ago
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