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3 years ago

PLEASE HELP! BEEN WAITING FOR R0 MINS!!! WILL GIVE 20 POINTS!!!!

Mathematics

2 answers:

dezoksy [38]3 years ago

7 0

If you subtract a negative it becomes a positive. no matter what. So if the equation is 1-(-5)=? it would be 6.

astraxan [27]3 years ago

5 0

Answer:

the two minus symbols cancel out making it positive 5

Step-by-step explanation:

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Determine which functions have two real number zeros by calculating the discriminant, b2 – 4ac. Check all that apply.

pantera1 [17]

Step-by-step explanation:

We need to write the function that have two real number zeros by calculating the discriminant i.e. $b^2-4ac$ .

We know that,

If D>0 the roots are real and unequal

If D= 0 roots are real and equal

If D< 0 roots are imaginary or not real and unequal

Function (1)

$f(x)=x^2 + 6x + 8\\\\D=6^2-4\times 1\times 8\\\\D=4$

D>0 the roots are real and unequal

Function (2)

$g(x)=x^2 + 4x + 8\\\\D=4^2-4\times 1\times 8\\\\D=-16$

D<0 the roots are real and unequal

Function (3)

$h(x)=x^2 -12x+32\\\\D=(-12)^2-4\times 1\times 32\\\\D=16$

D>0 the roots are real and unequal

Function (4)

$k(x)=x^2 +4x-1\\\\D=(4)^2-4\times 1\times (-1)\\\\D=20$

D>0 the roots are real and unequal

Function (5)

$p(x)=5x^2 +5x+4\\\\D=(5)^2-4\times 5\times 4\\\\D=-55$

D<0 the roots are real and unequal

Function (6)

$t(x)=x^2 -2x-15\\\\D=(-2)^2-4\times 1\times (-15)\\\\D=64$

D>0 the roots are real and unequal

(1),(3),(4) and (6) have two real number zeroes.

5 0

3 years ago

I need help with the math test

prohojiy [21]

5
1
-3
These are your answers

8 0

2 years ago

7x=2 what does x equal

IRISSAK [1]

X=2/7 if I’m correct:)

3 0

3 years ago

A block of ice has a square top and bottom and rectangular sides. At a certain point in

Lilit [14]

Answer:

$\frac{dV}{dt} = 360 \ cm^3/h$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Geometry

Volume of a Rectangular Prism: V = lwh

Calculus

Derivatives

Derivative Notation

Differentiating with respect to time

Basic Power Rule:

f(x) = cxⁿ
f’(x) = c·nxⁿ⁻¹

Step-by-step explanation:

Step 1: Define

$l = 30 \ cm\\w = l\\\frac{dl}{dt} = 2 \ cm/h\\h = 20 \ cm\\\frac{dh}{dt} = 3 \ cm/h$

Step 2: Differentiate

Rewrite [VRP]: $V = l^2h$
Differentiate [Basic Power Rule]: $\frac{dV}{dt} = 2l\frac{dl}{dt} \frac{dh}{dt}$

Step 3: Solve for Rate

Substitute: $\frac{dV}{dt} = 2(30 \ cm)(2 \ cm/h)(3 \ cm/h)$
Multiply: $\frac{dV}{dt} = 360 \ cm^3/h$

Here this tells us that our volume is decreasing (ice melting) at a rate of 360 cm³ per hour.

3 0

3 years ago

X divided by 2 Equals 5

Burka [1]

The answer is ten plz thank

4 0

3 years ago