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3 years ago

21 points for whoever can answer the first question!!

Mathematics

1 answer:

hodyreva [135]3 years ago

8 0

Answer:

Step-by-step explanation:

21 боладыма! дұрыспа

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What is 2.8 × 10^4 in standard form? A) 28,000 B) 2,800 C) 0.2800 D) 0.0028

Ganezh [65]

Answer:28000 B

Step-by-step explanation:

10^4 is 10000

2.8*10000 is 28000

4 0

3 years ago

Read 2 more answers

HELP ASAP!

enot [183]

Answer:

I believe the answer is (-1,5)

Step-by-step explanation: because when you draw it out on a coordinate plain (-1,5) lies right in the middle of these two points.

4 0

3 years ago

M=3rt squared -2rv solve for v.

insens350 [35]

M = 3rt^2 - 2rv
2rv = 3rt^2 - M
v = (3rt^2 - M)/2r

7 0

3 years ago

Jim is trying to improve his speed on the track so he can qualify for the State Championships. As he is running, he goes from 70

kumpel [21]

Answer:

His acceleration is $\frac{1}{15}$ meters per seconds²

Step-by-step explanation:

Acceleration is the rate of change of the speed

The formula of acceleration is $a=\frac{v_{f}-v_{i}}{t}$ , where

$v_{f}$ is the final speed
$v_{i}$ is the initial speed
The unit of the acceleration is meters/second²

∵ Jim goes from 70 meters/minute (beginning speed) to

106 meters/minute (final speed) in 9 seconds

∴ His initial speed $v_{i}$ = 70 meters/minute

- Change it the meter per second

∵ 1 minute = 60 seconds

∴ $\frac{70}{(1)(60)}=\frac{70}{60}=\frac{7}{6}$ meters/second

∴ $v_{i}$ = $\frac{7}{6}$ meters/second

∵ His final speed $v_{f}$ = 106 meters/minute

- Change it the meter per second

∴ $\frac{106}{(1)(60)}=\frac{106}{60}=\frac{53}{30}$ meters/second

∴ $v_{f}$ = $\frac{53}{30}$ meters/second

∵ The time of the change of his speed is 9 seconds

∴ t = 9

∵ The formula of acceleration is $a=\frac{v_{f}-v_{i}}{t}$

- Substitute the values of t, $v_{i}$ and $v_{f}$ in the formula above

∴ $a=\frac{\frac{53}{30}-\frac{7}{6}}{9}=\frac{1}{15}$

∴ His acceleration is $\frac{1}{15}$ meters per seconds²

3 0

3 years ago

Pls help. Abcdefjnshshsjnwishejjsjwhaunrshwjhd Jauahshwj

Lubov Fominskaja [6]

x = 72

Step-by-step explanation:

x + (2x - 36) = 180

3x - 36 = 180

3x = 180 + 36

3x = 216

x = 216/3

x = 72

6 0

2 years ago