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# math help plzzzzzzzzzzzzzzzzzzzzz?

Use Cramer's Rule to solve the following system of equations.

7x + 5y = 3

3x - 2y = 22

(4, -5)

(1, -2)

(0, 4)

none of these

It is not possible to multiply a 2x5 matrix and a 5x4 matrix.

True

False

When using Cramer's Rule to solve the system of equations containing

2x - y = 1

-4x + 3y = 0

the numerator for the y variable looks like which of these determinants?

The motion of a ball scooped by a field hockey player can be modeled by h = -16t2 + 40t, where t is the time in seconds and h is the height of the ball. Will the ball ever reach 25 feet in the air?

Yes

No

Cannot be determined by the information given.

If 3x - y = -3 and x + 5y = 15, what is the value of y?

0

1

2

3

What kind of solutions does ax2 - bx + c = 0 have if b2 - 4ac < 0?

two real solutions

two complex solutions

one complex solution

one real solutions

Factor x2 + 18x + 80 completely.

(x + 10) (x - 8)

( x - 10) (x - 8)

(x - 10)(x + 8)

none of these

What is the relationship between the lines y = 2x - 7 and y=1/2x - 2

parallel

perpendicular

neither

8y = 3x + 24 is a linear equation.

True

False

If a system of linear equations has one solution, the graph of the lines will be parallel.

True

False

What is the equation for the line that passes through the point (5, -4) and has a slope of -1?

y = x + 5

y = -x + 1

y = -x - 4

none of these

Evaluate 3x2 + 2x - 1 when x = -3.

-34

20

21

32

What type of polynomial is -25x4 - 21?

monomial

binomial

trinomial

none of these

Use synthetic substitution to find f(-2) for f(x) = x4 - 4x3 - 4x + 6

22

56

62

32

Factor x2 + 6x - 27completely.

(x - 9) (x - 3)

( x + 9) (x - 3)

(x + 9)(x + 3)

none of these

It is possible to multiply a 3x4 matrix and a 2x2 matrix.

True

False

im homeschooled so i dont have a teacher to help me with this

### 2 Answers

- Ms. NorburyLv 69 years agoFavorite Answer
Maybe it's time to pay attention to the teacher & do this yourself..

- jabezLv 44 years ago
it is rather uncomplicated to ascertain as quickly as you get the carry of the place the varible (commonly X) is going. you could determine those out in 2 easy steps. here is the trick: ___part __________=_____percent__________ entire one hundred (This on no account changes) 8 is what p.c. of sixteen? _____8_________=____X_______ sixteen one hundred here is the form you artwork it out: a million.) circulate Multiply 8*one hundred=800 sixteen*x=16x 2.) locate out what X is _16x____=___800__ sixteen sixteen 800/sixteen=50 X= 50% a million.5% of B= 40 5 ___45_____=__1.5_______ B one hundred a million.5*B= a million.5B 40 5*one hundred= 4500 a million.5B=4500 a million.5 = a million.5 4500/a million.5= 3,000 B=3,000