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hjlf
3 years ago
8

The sum of the digits of a two-digit number is 11. If the digits are reversed, the new number is 45 less than the original numbe

r.
Find the number.
Mathematics
1 answer:
astra-53 [7]3 years ago
7 0

Answer:

83.

Step-by-step explanation:

Let the digits be x and y so the number is xy.

x + y = 11

The new number is 45 less than the original number so

10y + x = 10x + y - 45

-9x + 9y = -45

-x + y = -5

x + y = 11          Adding:

2y = 6

y = 3

and x = 11/3 = 8.

So the number is 83.

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A horse weight is 700lb and needs medication that is 10mg per 100kg what is the horses weight in kg?
wel

Answer:

315 kg

Step-by-step explanation:

to find the weight of the horse:

1lb = 0.45 kg (rounded the .45)

(700lb) x (0.45)= 315

to find how much medicine they need:

315/10= 31.5

the horse wieghs 315kg meaning that they would need 31.5mg of medication.

7 0
3 years ago
5. Which image in the collage to the right is an
OleMash [197]

Answer:

B. A water wheel in a dry river

Step-by-step explanation:

Work is said to be done when a force moves a body or an object through a certain distance in the direction of the force. Thus for work to be done, force and distance are required.

i.e Work done = Force x distance

It is measured in Joules.

Also, the work done by an object could be a measured of potential energy.

So that,

Work done = potential energy = mass x gravitational force x height

Considering the collage in the question, since the water wheel is in a dry river no work is done. Water wheel is a device that functions through the flow of water body, thus causing its rotation.

3 0
3 years ago
Need help with this problem?
yuradex [85]

The total amount raised is the sum of the amounts raised by the car wash and the dinner. The car wash raised 7c - 18. The dinner raised 6s - 45. We now add the expressions and combine like terms.

7c - 18 + 6s - 45

We need to combine like terms. Like terms are terms that have the same variables and the same exponents on the variables. 7c and 6s are not like terms since c and s are different variables. They cannot be combined together. Plain numbers, like -18 and -45 are lime terms because their variable parts are the same; they both have no variables.

7c - 18 + 6s - 45 =

= 7c + 6s - 18 - 45

= 7c + 6s - 63

Answer:  C.  7c + 6s - 63

4 0
3 years ago
How many times greater is 7,000,000 than 70,000
Kryger [21]
The answer is 100 times
6 0
3 years ago
Question 2<br> Which TWO expressions are equivalent to<br> 1/2(2/3x-4)-2(1/4x-3)
VMariaS [17]

answer:

- 1/6 x + 4

steps by steps:

8 0
3 years ago
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