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ratelena [41]
3 years ago
9

Select equivalent or not equivalent for each pair of expressions

Mathematics
1 answer:
marissa [1.9K]3 years ago
3 0

Answer:

1: equivalent

2: equivalent

3: not equivalent

Step-by-step explanation:

for 1 & 2, you just switch the terms, but for 3, the 6z is not negative in the first expression, but it is in the second.

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A surfboard that has a regular price of $150 is on sale at a 40% discount. What is the sale price with a 9% tax?
Ahat [919]

Answer:

$98.10

Step-by-step explanation:

150 decrease 40% =

150 × (1 - 40%) = 150 × (1 - 0.4) = 90

90 increase 9% =

90 × (1 + 9%) = 90 × (1 + 0.09) = 98.1

8 0
3 years ago
What is the y-intercept of this quadratic function f(I)=-i2+10i-22
const2013 [10]

The y-intercept of the quadratic equation is -47.

<h3>What is Quadratic Equation?</h3>

A quadratic equation is an algebraic equation of the second degree in x. The quadratic equation in its standard form is ax² + bx + c = 0, where a and b are the coefficients, x is the variable, and c is the constant term.

Here, given quadratic equation;

    f(i) = i² + 10i - 22

or, y = i² + 10i - 22

     y = i² + 2.5x - (47-25)    

    y = i² + 2.5x + 25 - 47

    y = (i+5)² - 47

Thus, the y-intercept of the quadratic equation is -47.

Learn more about Quadratic Equations from:

brainly.com/question/2263981

#SPJ1

4 0
2 years ago
the description of a TV is based on the diagonal length. if the height of a TV is 10 inches and the width is 7 inches, what is t
borishaifa [10]
To calculate it use pythagoras: a^2+b^2=c^2
7^2+10^2=49+100=149

calculate the square root: \sqrt{149}=12.2
so the diagonal is about 12.2 inches long

8 0
3 years ago
ABCD is a trapezium.
lisabon 2012 [21]

The length of BC is 4.674 m

<u>Explanation:</u>

Given:

Angle A = angle B = 90°

AD = 2.1 m

AB = 1.9 m

CD= 3.2 m

An image is inserted for the reference

According to the figure,

a is the base

b is the height

c is the hypotenuse

Using pythagoras theorm:

a² + b² = c²

a² + (1.9)² = (3.2)²

a² + 3.61 = 10.24

a² = 6.63

a = 2.574

BC = 2.1 + 2.574

BC = 4.674m

Therefore, the length of BC is 4.674 m

7 0
3 years ago
A correlation coefficient of _____ indicates that the variables form a perfect linear relationship.
serg [7]
A correlation coefficient of 1 or -1 indicates that the variables form a perfect linear relationship.
8 0
3 years ago
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