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Natali5045456 [20]
3 years ago
5

What is the value of -2xy if x = -1 and y= 6? A. 12 B. -12 C. 26 D. 8

Mathematics
1 answer:
almond37 [142]3 years ago
6 0

Answer:

A. 12

Step-by-step explanation:

-2*-1=2*6=12

plz mark brainliest

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A. What is an equation of the line with slope -1/2 and y-intercept 2??
Brrunno [24]

Answer:

y = -(1/2)x + 2

Step-by-step explanation:

6 0
3 years ago
Someone please help me
s344n2d4d5 [400]
In order to prove these triangles congruent by SAS, AB and DE must be congruent. Thus, C is your answer.

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7 0
3 years ago
A motorboat takes 5 hours to travel 150 miles going upstream. The return trip takes 3 hours going downstream. What is the rate o
lys-0071 [83]

Answer:

The rate of the boat in still water is 40 miles per hour

The rate of the current is 10 miles per hour

Step-by-step explanation:

we know that        

The speed or rate is equal to divide the distance by the time

Let

x ----> the rate of the current (miles per hour)          

y ----> the rate of the boat in still water (miles per hour)        

we have that          

<em>going upstream              </em>

y-x=\frac{150}{5}        

y-x=30 ----> equation A            

<em>going downstream                                  </em>

y+x=\frac{150}{3}                            

y+x=50 ----> equation B                            

Solve the system of equations by elimination                            

Adds equation A and equation B                                      

y-x=30\\y+x=50\\------\\y+y=30+50\\2y=80\\y=40                    

<em>Find the value of x                                </em>

y+x=50                

40+x=50            

x=10          

therefore          

The rate of the boat in still water is 40 miles per hour      

The rate of the current is 10 miles per hour      

8 0
3 years ago
Kathleen correctly determines four arithmetic means between −7 and 14. What values does Kathleen determine?
Annette [7]

Answer:

  Kathleen determines the four arithmetic means to be −2.8 , 1.4, 5.6, and 9.8.

Step-by-step explanation:

The overall interval is 14 -(-7) = 21 units in length. The four equally-spaced "means" divide the interval into 5 equal parts, each one of which is ...

  21/5 = 4.2

The four means are ...

  -7 +4.2 = -2.8

  -2.8 +4.2 = 1.4

  1.4 +4.2 = 5.6

  5.6 +4.2 = 9.8

5 0
3 years ago
You deposit $5000 in an account earning 7.5% simple interest . How long will it take for the balance of the account to be $6500
GREYUIT [131]
Since this is a problem of simple interest, then the interest earned will be based always on the principal amount which is 5000. So assuming that, lets also assume that the duration to get interest will be in years since that is the most commonly used duration anyway. So first, let's multiply 5000 with 0.075 to get the interest for the first year. So we will have 375. This means that we will be getting 375 interest every year. We can do trial an error method to get the number of years that will yield us to 6500. Through that, I was able to get 4 years. So 4 times 375 equals  1500 plus the original balance of 5000. It will take 4 years before your balance reaches 6500
7 0
3 years ago
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