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3 years ago

Please help :) Which expression is equal to 6+4×5 ? A 10 times 5 B 6 plus 20 C 6 plus 9

Mathematics

2 answers:

Marianna [84]3 years ago

6 0

Answer:

Step-by-step explanation:

By pemdas - multiplication first

6+4x5

6+(20)

so, b - 6 + 20 is the answer

Sonbull [250]3 years ago

4 0

Answer:

Step-by-step explanation:

6 + 4*5 = 6 + 20

= 26

According to BODMAS, multiplication should be done and then addition

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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

How to solve for x 15 + 8x = 45 + 6x

Reil [10]

Answer:

Step-by-step explanation:

Let's solve your equation step-by-step.

15+8x=45+6x

Step 1: Simplify both sides of the equation.

8x+15=6x+45

Step 2: Subtract 6x from both sides.

8x+15−6x=6x+45−6x

2x+15=45

Step 3: Subtract 15 from both sides.

2x+15−15=45−15

2x=30

Step 4: Divide both sides by 2.

x=15

Answer:

x=15

5 0

4 years ago

Read 2 more answers

For t=2, 15t - 2t is equal to

weqwewe [10]

Answer:

Step-by-step explanation:

=15(2) - 2(2)

=30 - 4

=26

6 0

3 years ago

In the figure, ABC and DEF are similar. What's the scale factor from ABC to DEF?

Elena-2011 [213]

Answer:

Step-by-step explanation:

The scale factor of ABC to DEF is the number you need to multiply a corresponding side of ABC to get one of DBC. We are given the two triangles are similar, so we can say that sides AB and DE are proportional. We are looking for the number we need to multiply AB by to get DE. From this relation, we can get the equation:

AB * x = DE

where x is our scale factor. We can substitute in the values of AB and DE, and solve for x:

5x = 15

x = 3

Therefore, the scale factor is three. This means that you can multiply any side of ABC by 3 to get a side of DEF.

7 0

3 years ago

The circumference of a planet is about 23,000 miles. Find its diameter to the nearest mile.

lakkis [162]

Circumference = $\pi d$

We know that the circumference in here is equal to 23000 miles.

23000 = pi x d

pi will be approximated to 3.14

23000 = 3.14d

divide both sides by 3.14 to get
about 7325 as the diameter

7 0

3 years ago

Read 2 more answers