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3 years ago

-2v - 7 =-23 15 8 -8 -15

Mathematics

1 answer:

Angelina_Jolie [31]3 years ago

8 0

To solve, you can undo the addition of -7, then undo the multiplication by -2.

... -2v = -16 . . . . . add 7

... v = 8 . . . . . . . . .divide by -2

The appropriate choice is

... 8

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Find the value of x A. 8 B. 12 C. 4 4. 16

Airida [17]

Answer: 3 x 4 is 12 Is your answer mark my brainliest

Step-by-step explanation:

7 0

3 years ago

A truck travels 500 miles at an average speed of 60 miles per hour on a return trip on the same route and travels at an average

marta [7]

The return trip took 1 hour 42 minutes longer

Further explanation:

The distance will remain same on return.

The formula for speed is given by:

$Speed=\frac{Distance}{Time}$

Let d be the distance

s1 be the speed while going and s2 be the speed while returning

and

t1 be the time while going and t2 be the time while returning

d=500 miles

s1=60 miles per hour

s2=50 miles per hour

We have to calculate time for both trips,

So,

Time while Going:

$s_1=\frac{d}{t_1}\\t_1=\frac{d}{s_1}$

Putting the values of d and s1

$t_1=\frac{500}{60}\\=8.3\ hours$

Converting 8.3

8 will be the hours,

for 0.3 hour

0.3*60=18 minutes

The first trip took 8 hours and 18 minutes.

Time while returning:

$s_2=\frac{d}{t_2}\\t_2=\frac{d}{s_2}$

Putting the values of d and s1

$t_2=\frac{500}{50}\\=10\ hours$

The difference of both times is: 1 hour 42 minutes

So,

The return trip took 1 hour 42 minutes longer

Keywords: Time, Distance, Speed

Learn more about movement at:

#LearnwithBrainly

8 0

3 years ago

Need help don’t understand

Xelga [282]

Answer:

2 real solutions

Step-by-step explanation:

To determine the nature of the solutions use the discriminant

Δ = b² - 4ac

• If b² - 4ac > 0 then 2 real solutions

• If b² - 4ac = 0 the 2 real and equal solutions

• If b² - 4ac < 0 then no real solutions

Given

x² + 9x + 20 = 0 ← in standard form

with a = 1, b = 9, c = 20, then

b² - 4ac

= 9² - (4 × 1 × 20 ) = 81 - 80 = 1

Since b² - 4ac > 0 then there are 2 real solutions

7 0

3 years ago

Round off to nearest 10 of 194 Need this answer now, ASAP Thanks

9966 [12]

200, your round 196 up because its at or above 5

6 0

3 years ago

Whats 11+(-3)-1/8 j-3/8 j+7 ? Thanks in advance!

Anuta_ua [19.1K]

Answer:

Your answer is

$=-\frac{j}{2}+15$

Step-by-step explanation:

11+(-3)-1/8 j-3/8 j+7

$=11+\left(-3\right)-\frac{1}{8}j-\frac{3}{8}j+7\\$

$=11-3-\frac{1}{8}j-\frac{3}{8}j+7$

add the similar objects

$=11-3-\frac{1}{2}j+7$

$=\frac{1}{2}j=\frac{j}{2}$

$=11-3-\frac{j}{2}+7$

$=-\frac{j}{2}+15$

6 0

3 years ago