Answer:
-124
Step-by-step explanation:
The equation for a discriminant is:
So for
a = 7 b = - 4 c = 5
Plug values into the equation.
16 - 140 = -124
What is the factored form of the polynomial? z2 − 10z 25 (z − 5)(z − 5) (z 5)(z 5) (z − 2)(z 5) (z 2)(z − 5).
1 answer:
The factors of the equation are (z − 5)(z − 5).
Given
Equation;
Splitting the middle term Using formula Using Quadratic formula Using algebraic identities
The factors of the equation are;
Hence, the factors of the equation are (z − 5)(z − 5).
To know more about factors click the link given below.
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Using the mean concept, it is found that we will need 15 more points to bring up his average up to 90%.
The mean of a data-set is the <u>sum of all observations divided by the number of observations</u>.
In this problem:
- In the first 5 observations, total of 21 out of 25 points, hence the mean for these observations is
.
- In the next n observations, mean of 1.
Hence, the mean is:
We want the mean to be of 0.9, thus:
3 more testes are need, each worth 5 points, hence, 15 more points are needed to bring up his average up to 90%.
A similar problem is given at brainly.com/question/25323941