algebra
posted by Lee
Coulld someone take the time and check my answers please.
11) without graphing is the system independent, dependent, or inconsistent?
y=x+5
3x3y=15
(my answer; dependent)
12) your club is baking vanilla and chocolate cakes for a bake sale. they need at most 19 cakes you cannot have more than 14 chocolate cakes. write and graph a systme of inequalities to model this system.
(my answer;
let x=the number of vanilla cakes
let y=the number of chocolate cakes
x>=0
y>=0
x+y<=19
y<=14)
13)which matrix represents the system of equations below?
12x13y+13z=15
7x10y3x=11
7x+14y+5z=5
(my answer;
12 13 13 15
7 10 3 11
7 14 5 5)
14) which graph represents y=3(x3)^2+3
(my answer; go over 3units to right up 3 and make a u shape upward)
16)what is the equation in standard form of a parabola that models the values in the table?
x 2 0 4
f(x) 4 6 70
(possible answers)
y=3x^2+4x6
y=4x^2+3x6
y=6x^2+3x4
y=4x^23x+6
didnt understand this one
17) what value completes the square for the expression.
x^212x
(my answer; 36)
18) Use the quadratic formula to solve the equation.
x^2+7x=8
(my answer; 7/2 + sqrt34/2)
19)simplify the expression.
(6i)(4i)
(my answer; 24)
20) use graphing to find the solutions to the system of equations
y=x^25x+3
y=x2
(my answer; (5,3)(1,3)
21) classify 5x^5+3x^48x^3+12 by number of terms.
(my answer; polynomial of 5 terms)
22) what are the zeros of the function graph the function
y=(x+3)(x+2)(x2)
(my answer; 3,2,2 graph upside down u on left bottom and straight line up and down on right side
23)find the real solutions of the equation
8x^317x^2+7x=0
(didnt understand possible choices
0,2.48,0.35
2.48
2.48,0.35
0.248,0.35)
24) find the rational roots of
x^4+8x^3+7x^240x60=0
(my answer; 6,2)
25) find all the zeroes of the equation
27x^2324=x^4
(my answer; 3,3,6i,6i)
Any help or explanations is helpful have an exam coming up and trying to review
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