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3 years ago

Help? I can't get a hold of it.

Mathematics

1 answer:

user100 [1]3 years ago

6 0

Answer:

steps below

Step-by-step explanation:

x < -10

|1+2x| < 0 ∴ |1+2x| = -(1+2x)

|5 − 3x| > 0 ∴ |5 − 3x| = 5-3x

|−5x − 8 | > 0 ∴ |−5x − 8 | = -5x-8

|1 + 2x| + |5 − 3x| − |−5x − 8 |

= -(1+2x) + (5-3x) - (-5x-8)

= (-2x - 3x + 5x) + (-1 + 5 + 8)

= 12

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Two old rsm students were standing twenty feet apart when they spotted mrs. rifkin. if they immediately run in opposite directio

Black_prince [1.1K]

Speed of student A is 180 ft/min
Speed of student B is 120 ft/min
Relative speed=(120+180)=300 ft/min
Distance between them is 2420 ft
Time taken for them to meet will be:
time=distance/speed
=(2420-20)/300
=8 min

3 0

4 years ago

Read 2 more answers

HELP

Reptile [31]

Answer:

The time it takes for the cannonball to hit the ground is 6.49 seconds.

Step-by-step explanation:

You know that the height of the cannonball above the ground, h, in meters, in time, t, in seconds, is found by the function h(t) = -4.9t² + 30.5t + 8.4. You want to calculate the time it takes for the cannonball to hit the ground, that is, the time it takes for the bullet to reach zero height. So, being h(t) = 0 you have:

0 = -4.9t² + 30.5t + 8.4

To solve a quadratic function 0=a*x² + b*x +c, the expression is applied:

$\frac{-b+-\sqrt{b^{2} -4*a*c} }{2*a}$

In this case, being a = -4.9, b =30.5 and c =8.4 you have:

$\frac{-30.5+-\sqrt{30.5^{2} -4*(-4.9)*8.4} }{2*(-4.9)}$

Solving you get:

t1= -0.26 seconds and t2=6.49 seconds

Since time does not have a negative value, then the time it takes for the cannonball to hit the ground is 6.49 seconds.

3 0

3 years ago

Please help me with this.

seraphim [82]

Answer:

c=9

Step-by-step explanation:

6 0

3 years ago

How many solutions does the equation |x+7|= -1 have?

KonstantinChe [14]

None.

The absolute value of something cannot be negative.

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4 years ago

Nathan opens a new savings account and makes an initial deposit of $400.

AfilCa [17]

Answer:

The answer to the first one is 6

Step-by-step explanation:

If the time frame given is 9 months, then we can find that 9 months is 3/4 of a year. 3/4 x 2% = 0.015. 0.015 x 400 = 6. He would have made 6 dollars in 9 months.

Answer the the second one:

4.5% x 5 (years) = 0.225. 0.225 x 10,000 = 2,250. Since this is a car loan and not a bank interest for example, we add it to the total cost. I'm pretty sure its the third one.

6 0

4 years ago