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3 years ago

Find the dot product of v=-7i+4j and w=-6+5j

Mathematics

1 answer:

Anna35 [415]3 years ago

6 0

V•w = (-7i +4j)•(-6i +5j) = (-7)×(-6) +4×5 = 42 +20
v•w = 62

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I need help on question b please it hard

Dimas [21]

Answer:

For each line you have to have 3 numbers that would add up to 2 km.

Step-by-step explanation:

For example:

The first line has 1600m and you need to figure out what the other two are. Each line has to add up to 2 km.

1km = 1000m

Hope this helps :)

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3 years ago

* WILL GIVE BRIANLIEST 5 QS PLZZ HELP MEH ;D*(07.01)What is the solution to the equation 5x = 40?

Maru [420]

Hello there! :)

Answer:

1. B. 8. and x=8

*The answer must have a positive sign.*

2. D. Infinitely many.

3. D. -1 and y=-1

*The answer must have a negative sign.*

4. C. He didn't add 13 to 26.

5. B. 4 and y=4

*The answer must have a positive sign.*

Step-by-step explanation:

1. First, you divide by 5 from both sides of an equation.

$\frac{5x}{5}=\frac{40}{5}$

Then, simplify.

$40/5=8$

Answer: → $\boxed{x=8}$

_______________________________________________

2. 4x=4x both sides are equal and it's true.

Answer: $\boxed{D.}$

________________________________________________

3. First, switch sides of an equation.

$y+9=8$

Then, you subtract by 9 from both sides of an equation.

$y+9-9=8-9$

Simplify and solve.

$8-9=-1$

Answer: → $\boxed{y=-1}$

________________________________________________________

4. First, add by 13 from both sides of an equation.

$x-13+13=26+13$

Then simplify and solve.

$26+13=39$

Answer: $\boxed{x=39}$ and $\boxed{C.}$

_______________________________________________________

5. First, subtract by 9 from both sides of an equation.

$y+9-9=13-9$

Then simplify and solve.

$13-9=4$

Answer: $\boxed{y=4}$

______________________________________________________

Hope this helps!

Thanks!

-Charlie

Have a great day!

6 0

3 years ago

I need this answer ASAP

beks73 [17]

an integer is a positive negative or zero

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3 years ago

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The marching band at parkland high school has 128 students of these 18.75% are ninth graders how many ninth graders are there in

Helen [10]

Hey, Melany. To answer this problem, simply set up a proportion: $\frac{18.75}{100} = \frac{x}{128}$ . Now let's solve for x.

- Cross multiply: $\frac{18.75*128}{100*x} --> 2400 = 100x$

- Isolate x:

$\frac{2400}{100} = \frac{100x}{100}$

This means that x = 24.

There are 24 9th graders in the band.

6 0

3 years ago

C. Explain why 32 percent is equivalent to

11Alexandr11 [23.1K]

Answer: 32% is equal to 32/100.

Step-by-step explanation: This is because 32% is also equal to 0.32. Percents are evaluted with the fraction denominator 100. 32/100 is also 32 parts out of 100 parts. This expression represents 32%.

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3 years ago