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3 years ago

15

Systems(substitutions)

1 answer:

gogolik [260]3 years ago

3 0

Answer:

works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, "substituting" for the chosen variable and solving for the other. Then you back-solve for the first variable.

Step-by-step explanation:

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you plan to purchase a plane ticket $299.00and you are going to use a discount code to receive 15% off

Xelga [282]

Answer: The answer is $254.15

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3 years ago

Cards labeled 5, 6, 7, 8, and 9 are in a stack. A card is drawn and not replaced. Then, a second card is drawn at random. Find t

Rom4ik [11]

Answer:

1/10

Step-by-step explanation:

the probability of your first pick was 1/5, if not retured=ned, the probability of you getting an even number next will then be 2/4. (1/5)(2/4)=1/10

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3 years ago

I need help on 2 and 3

Andrej [43]

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Step-by-step explanation:

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3 years ago

A ladder 10 feet long rests against a vertical wall. Initially, the top of the ladder is 8 feet above the ground. If the top of

lora16 [44]

Step-by-step explanation:

Let vertical height of ladder from ground be y and

horizontal distance of the base of the ladder from the wall be x respectively.

Length of the ladder = l (constant) = 10 ft

<u>Using Pythagoras theorem</u>:

${l}^{2} = {y}^{2} + {x}^{2}$

Differentiate both sides w.r.t time

$0 = 2y \frac{dy}{dt} + 2x \frac{dx}{dt}$

$y \frac{dy}{dt} + x \frac{dx}{dt} = 0$

<u>We know that</u> (After 1 sec, y = 6 ft and x = 8 ft ; dy/dt = 2 ft/sec)

$6\times 2 + 8\frac{dx}{dt} = 0$

$\frac{dx}{dt} = - 1.5 ft \: per \: sec$

<u>( Ignore - ive sign)</u>

Therefore, bottom of the ladder is sliding away from the wall at a speed of 1.5 ft/sec one second after the ladder starts sliding.

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3 years ago

T-shirts and sweatshirts were sold at a local shop. One salesperson sold three T-shirts and seven sweatshirts for a total amount

natulia [17]

Answer:

B. - Three T-Shirts and Seven Sweatshirts: $37.5 + $203 =<u>240.50 </u>

- Six T-Shirts and Five Sweatshirts: $75 + $145 = <u>$220</u>

Step-by-step explanation:

A. - Three T-Shirts and Seven Sweatshirts: $27 + $213.50 = <u>$240.50</u>

- Six T-Shirts and Five Sweatshirts: $54 + $152.5 = <u>$206.5</u>

B. - Three T-Shirts and Seven Sweatshirts: $37.5 + $203 =<u>240.50 </u>

- Six T-Shirts and Five Sweatshirts: $75 + $145 = <u>$220</u>

C. - Three T-Shirts and Seven Sweatshirts: $35.01 + $210 = <u>$245.01</u>

- Six T-Shirts and Five Sweatshirts: $70.02 + $150 = <u>$220.02</u>

<u></u>

<u>Mark as Branliest Please! :)</u>

7 0

2 years ago