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bezimeni [28]
3 years ago
5

On the occasion of New year a super market announces a discount of 20

Mathematics
1 answer:
Illusion [34]3 years ago
7 0

Step - 1: Calculate 20% of 840.

840 \times \frac {20}{100} = 168

Step - 2: Subtract from 840.

840-168=672

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How do I get the answer y= 2x^2+9x-5
guapka [62]

Answer:

Quadratic Formula

so

x = -5

and

x = 0.5

Step-by-step explanation:

Whenever you see a problem in this form, which you will see a lot of, you can try to factor it or use the "least squares" method or what have you, but those won't always work, unfortunately.

Fortunately, the quadratic formula will never fail you with quadratic expressions.

This is the Quadratic Formula

x = \frac{-b \frac{+}{-} \sqrt{b^2-4ac}  }{2a}

a is the the number on the variable with the exponent ^2

b is the number on the variable with no exponent

c is the third number

a and b cannot be equal to 0; c can be

Since we're looking for a number with an equation that has a square root in it, we're going to get two answers. These two answers come from the radical being separately added AND subtracted from the radical. It's basically two problems.

Plugging  in our numbers to this equation gives us x values of -5 and 0.5. This will always work with polynomials with factors of ^2 in them.

If you have a TI-84 calculator or newer, there's a tool on it that will factor polynomials like this one for you just by giving it the numbers.

7 0
3 years ago
Given the function f(x)=-8x2+8x+9,state whether the vertex represents a maximum or minimum point for the function.
Lelechka [254]
8x2+8x+9
=16x+8x+9
=24x+9
Are that right
5 0
3 years ago
A recent study revealed that the average weight of babies born in the US is normally distributed with a mean of 7.5 pounds. One
Andreyy89

Answer:

c. Weights of babies are normally distributed

Step-by-step explanation:

The research has been conducted to identify the weight of new born babies in comparison to the weight of their mother. The samples are collected from young mothers who are at age of 16 to 18. The babies average weight turned out to be 7.3 pounds. It is assumed that the weight of babies is normally distributed.

7 0
3 years ago
What is the number in scientific notation? 135,000,000,000,000
Sati [7]

it would be 1.35 x 10^14

6 0
2 years ago
Read 2 more answers
F(x) = x - 1. Find the inverse of f(x).
bekas [8.4K]

Answer:

f^-1(x) = x+1

Step-by-step explanation:

turn into y = x-1

1. Flip x to y and y to x

   x = y-1

2. isolate y

x+1 = y

using a graph you can find it by reflecting x-1 over y=x

     

8 0
2 years ago
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