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3 years ago

13

Use the distributive property –4(a + 3)

1 answer:

oksian1 [2.3K]3 years ago

4 0

Answer:

-4a - 12

Step-by-step explanation:

-4(a+3)

-4(a) + -4(3)

-4a + -12

-4a - 12

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How many seconds will light leaving Los Angeles take to reach the following locations (a) San Francisco (about 500km), (b) Londo

kondor19780726 [428]

Answer:

a) It takes 0.0017s for the light to reach San Francisco.

b) It takes 0.033s for the light to reach London.

c) It takes 1.334s for the light to reach Mars.

d) It takes 149.7s for the light to reach Venus.

Step-by-step explanation:

Here we can solve this problem by using this following formula:

$s = \frac{d}{t}$

In which s is the speed(in km/s), d is the distance(in km) and t is the time(in s).

The light speed is 299 792 458 m / s = 299,792.458 km/s, so $s = 299,792.458$

(a) San Francisco (about 500km)

Find t when $d = 500$ . So

$s = \frac{d}{t}$

$299,792.458 = \frac{500}{t}$

$299,792.458t = 500$

$t = \frac{500}{299,792.458}$

$t = 0.0017s$

It takes 0.0017s for the light to reach San Francisco.

b) London(about 10,000km)

Find t when $d = 10,000$ . So

$s = \frac{d}{t}$

$299,792.458 = \frac{10,000}{t}$

$299,792.458t = 10,000$

$t = \frac{10,000}{299,792.458}$

$t = 0.033s$

It takes 0.033s for the light to reach London.

(c) the Moon (400,000km)

Find t when $d = 400,000$ . So

$s = \frac{d}{t}$

$299,792.458 = \frac{400,000}{t}$

$299,792.458t = 400,000$

$t = \frac{400,000}{299,792.458}$

$t = 1.334s$

It takes 1.334s for the light to reach Mars.

(d) Venus (0.3 A.U. from Earth at its closest approach).

Each A.U. has 149,59,7871 km.

So 0.3 A.U. = 0.3*(149,597,871) = 44,879,361.3. This means that $d = 44,879,361.3$ . So:

$s = \frac{d}{t}$

$299,792.458 = \frac{44,879,361.3}{t}$

$299,792.458t = 44,879,361.3$

$t = \frac{44,879,361.3}{299,792.458}$

$t = 149.7s$

It takes 149.7s for the light to reach Venus.

3 0

3 years ago

Find the slope of the passing line through the points -3/8 and 4/8

Vitek1552 [10]

Answer:

Subtract the y's: 7 - 2 = 5

Subtract the x's in the same order: 6 - 4 = 2

slope = (difference in y)/(difference in x) = 5/2

Answer: 5/2

8 0

3 years ago

(3x2 + 4x - 2) - (5x + 7)

Vlad [161]

Answer:expand?

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Norma bought 1 3/4 yards of cotton fabric and 3 3/8 yards of fleece fabric.

aalyn [17]

1 3/4 + 3 3/8
get a common denominator by multiplying 1 3/4 by 2 to get a denominator of 8
1 3/4 becomes 1 6/8
1 6/8 + 3 3/8 = 5 1/8 yards
so the answer is
C. 5 1 / 8 Yards

4 0

4 years ago

Read 2 more answers

I need help asapppppp please

chubhunter [2.5K]

Answer:

$\mathrm{A}$

Step-by-step explanation:

$x=-3\\y=2$

$y=4(x+3)^2+2$

Put x as -3.

$y=4((-3)+3)^2+2$

$y=4(0)^2+2$

$y=4(0)+2$

$y=0+2$

$y=2$

Hence, y equals to 2.

3 0

3 years ago

Read 2 more answers