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3 years ago

Evaluate the following expression if a = -6, b = 2/3 and c = -5.5 : -ab - ac

Mathematics

2 answers:

11111nata11111 [884]3 years ago

3 0

Answer:

-29

Step-by-step explanation:

-ab-ac

= -(-6)(2/3)-(-6)(-5.5)

=4-33

= -29

TiliK225 [7]3 years ago

3 0

Answer:

-29

Step-by-step explanation:

-ab - ac

a = -6, b = 2/3 and c = -5.5

Substitute these values into the equation

- (-6) * 2/3 - (-6) (-5.5)

Negative negatives are positive

6 *2/3 +6(-5.5)

Multiply and divide

4 -33

Add and subtract

-29

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cellular phone companies often package their products to make them more attractive to potential users. if you average 356 minute

Lemur [1.5K]

Answer: package B is the better deal.

Step-by-step explanation:

package A offers free phone and 300 minutes. it will cost 0.12 per minute for each minute over the plan time. Also, package A has a base rate of $39.95. This means that if you average 356 minutes per month in talk time, the cost using package A would be

0.12(356 - 300) + 39.95 = $46.67

package B : phone costs $10 and has 350 minutes of time and 0.08 per minute for each minute over the plan time. Also, package B has a base rate of 35.95 not including the phone. This means that if you average 356 minutes per month in talk time, the cost using package B would be

10 + 0.08(356 - 350) + 35.95 = $46.43

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3 years ago

Share $210 in the ratio of 2:5

horrorfan [7]

Answer:

60:150

Step-by-step explanation:

So first you can divide 210 by 7 since it will be spilt into seven parts.

210/7 = 30

So in order to get them into the ratios:

30 x 2 = 60

30 x 5 = 150

So 210 in the ratio of 2:5 would be 60:150

You can check your work by adding 60 + 150 together.

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3 years ago

A machine lifts up containers of coal from the mine and lowers empty containers down. The machine uses an electric motor connect

Shkiper50 [21]

Answer:

The maximum power available to the motor is 2.4 MW

Step-by-step explanation:

The power of a circuit that has a current, I, and a voltage, V, is given by the relation

Electrical power, P = I²R = I× I×R = I × V

Therefore given that the parameters are;

Voltage in the d.c. power supply = 600 V d.c.

Maximum current in the motor = 4000 A

Therefore, we can find the power as follows;

Maximum motor power = Voltage × Current

The maximum motor power, P available = 600 V × 4000 A = 2400000 W which on converting to MW becomes;

The maximum power available to the motor , P = 2.4 MW.

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3 years ago

ritas room is of a rectangular prism. it is 12 feet long,10 feet wide, and 8 feet high. what is the surface area of ritas room?

DENIUS [597]

*Hint: The formula for finding the surface area of a rectangular prism is SA = 2 (wh + lw + lh).

Now, just plug in and solve.

SA = 2 [(10)(8) + (12)(10) + (12)(8)]
SA = 2 (80 + 120 + 96)
SA = 2 (296)
SA = 592.

The surface area of Rita's room is 592 feet squared.

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