All categories

2 years ago

Please help with this

Mathematics

1 answer:

Svetllana [295]2 years ago

7 0

To solve this equation, all you need to do is substitute the value of x that would be like this y = -2 (-3) -7 and solve, the answer would be -1.

You might be interested in

Two canoes travel down a river, starting at 9:00 a.M. One canoe travels twice as fast as the other. After 4.5 hours, the canoes

Vedmedyk [2.9K]

Answer:

$v_1=3.33 \ miles/hour\\v_2=6.66 \ miles/hour$

Step-by-step explanation:

Constant Speed Motion

When the object travels the same distances in the same period of time, the speed is constant and is can be calculated as

$\displaystyle v=\frac{x}{t}$

where x is the distance and t is the time

There are two canoes traveling at speeds v1 and v2. One of them has twice the speed as the other. Let's say

$v_2=2v_1$

When t hours have passed, the canoes have traveled x1 and x2 respectively.

$x_1=v_1t$

$x_2=v_2t$

Since

$v_2=2v_1$

Then

$x_2=2v_1t$

The distance between them is

$X=x_2-x_1=2v_1t-v_1t$

$X=v_1t$

That distance is known and equals 11.25 miles, thus

$v_1t=15$

Solving for v1 and using t=4.5 hours

$\displaystyle v_1=\frac{15}{4.5}$

$v_1=3.33 \ miles/hour$

$v_2=2\times 3.33$

$\boxed{v_2=6.66 \ miles/hour}$

6 0

2 years ago

Find the sum of the even numbers shown below. 2+4+6+8+...+66+68+70

Mandarinka [93]

The sum its +2

2+2=4

4+2=6

6+2=8

8+2=10

And so on the numbers just keep sum for 2

5 0

2 years ago

7. Evaluate this expression if x=-2* 3x2 - 4x

natali 33 [55]

Answer: x=0 or x= -5/6

Step-by-step explanation: x=((−2)(3))(x2)−4x

8 0

2 years ago

1). 3x-8 for x=5 2). 5(x+7)-1 for x = -3

Serjik [45]

1. =7
2.=19
Please let me know if you got it correct!

4 0

2 years ago

Scott counted 23 beats in 10 seconds. What is his approximate heart rate?

goblinko [34]

Answer:

138

Step-by-step explanation:

There is 60 seconds in a minute, so if the heart beats 23 times in 10 seconds, it is 138 bpm.

23 * 6 = 138

7 0

1 year ago

Read 2 more answers