<h2>
Hello!</h2>
The answer is:
It takes Ella 3 seconds to do a push-up and 3 seconds to do a sit up.
<h2>Why?</h2>
To find how many seconds Ella took to do a push-up and a sit-up we must write two equations using the given information.
Let be "x" the time needed to push-ups and "y" be the time needed to do sit-ups.
So, writing the equations we have:
First equation,
If she can do 13 push-ups and 7 sit-ups in 60 seconds, we have:
Second equation,
If she can do 13 push-ups and 19 sit-ups in 96 seconds, we have:
Now, creating a system of equations, and using the reduction method to solve it, we have:
Multiplying the first equation by -1, we have:
Then, substituting "y" into the first equation, we have:
Hence, we have that It takes Ella 3 seconds to do a push-up and 3 seconds to do a sit up.
Have a nice day!
Answer:
In a different plan for area codes a number can be any digit from 1-7 the second number was either 4,5,6,7 and the third digit can be any number except 6-8.With this plan how many different area codes are possible?
1st digit:: 7 ways
2nd digit:: 4 ways
3rd digit:: 7 ways
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Ans: 7*4*7 = 196
Step-by-step explanation:
Answer:
terms, 2x, 3y , x and 7,
like terms, 2x, 3y, x and 7
Coefficient. 2 is the coefficient of 2x and 3 is the coefficient of 2y 1 is the coefficient of x
Constant. 7
Step-by-step explanation:
Given:
Terms are the number of parts in the expression.
there are four terms 2x, 3y , x and 7,
Like terms are the part of the polynomials. 2x, 3y and x are like terms because they both have an x attached. 7 is like terms because they have nothing attached.
The number that are attached to variable is called Coefficient.
So In the term 2x the number 2 is a coefficient because it is attached to x similarly 3y the number 3 is a coefficient because it is attached to y
and in the term x the number 1 is a coefficient.
Constant are the numbers that are not attached to any variable and it is not change. Such as 7 is the constant term.
Answer:
x<3
Step-by-step explanation:
Answer:
The sale amount of the pair of shoes will be: $27
Step-by-step explanation:
The original price = $29.99
Mark down = 10%
Mark down amount = 10% × 29.99
= 0.1 × 29.99
= $2.99
Thus, the sale price = Original price - Mark down amount
= $29.99 - $2.99
= $27
Therefore, the sale amount of the pair of shoes will be: $27