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3 years ago

Samuel charged me d dollars to fix my broken heater. He

Mathematics

1 answer:

juin [17]3 years ago

3 0

Answer:

$15 per hour

Step-by-step explanation:

Since he charged $65 for the parts, and the total charge was $110, that's $110-$65 which is $45, the total hours was 3, so $45 divided by 3, and that equals $15.

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In a field there are cows, birds, and spiders. Spiders have 4 eyes and 8 legs each. In the field there are 20 eyes and 30 legs.

Kitty [74]

Answer:

1 spider, 3 cows, 5 birds.

Step-by-step explanation:

Cows (C): 4 legs, 2 eyes.

Birds (B): 2 legs, 2 eyes.

Spiders (S): 8 legs, 4 eyes.

The number of legs and eyes are given, respectively by:

$30 = 4C+2B+8S\\20 = 2C+2B+4S$

Multiplying the second equation by -2 and adding it to the first one gives us the number of birds:

$30 -40= 4C-4C+2B-4B+8S-8S\\-10 = -2B\\B=5$

Rewriting the original equations with B =5:

$30 = 4C+2*5+8S\\20 = 2C+2*5+4S\\20 = 4C+8S\\10 = 2C+4S\\C=5-2S$

Since the number of cows cannot be negative, and both C and S must be odd numbers, the only possible value of S is 1:

$C=5-2S\\S=1\\C=3$

7 0

3 years ago

What is the discriminating for 2x^2-7x+5 A.49 B.-9 C.9 D.40

otez555 [7]

Your answer would be C because you have to do B^2- 4(A)(B)
the then u have to plug in and you will get C

7 0

3 years ago

A mole dogs 60 feet and takes a break.Then it digs 130 feet and takes another break.Then it digs 28 feet and takes a break.Final

Rina8888 [55]

Answer:

300

Step-by-step explanation:

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3 0

3 years ago

Read 2 more answers

Geometry! Please help!

Sladkaya [172]

Hello!

The volume of a cone is Volume = 1/3πr²h.

V = 1/3π(10)²(9)
= 1/3π100(9)
= 1/3π900
= 300π cm³

Therefore, the volume of this right cone is 300π cm³.

4 0

3 years ago

Read 2 more answers

£54 is 10% off what is the the original price

Schach [20]

Answer:

48.6

Step-by-step explanation:

50/10=5

4/10=.4

54-5.4=48.6

6 0

3 years ago