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3 years ago

Will mark brainlist!! help please

Mathematics

1 answer:

lapo4ka [179]3 years ago

6 0

Answer:

It is the 3rd one 9/5y+9.

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If contact lenses cost 80$ how much will they cost if they are with 10% off?

nevsk [136]

10% of 80 = 8

80 - 8 = 72

if they are 10% off, the contact lenses will cost $72

6 0

2 years ago

PLEASE HELP find the vertex of f(x)=x^2+2x+3 (make sure you show your work)

kotegsom [21]

Answer:

(- 1, 2)

Step-by-step explanation:

Given a quadratic in standard form y = ax² + bx + c : a ≠ 0

Then the x- coordinate of the vertex is

$x_{vertex}$ = - $\frac{b}{2a}$

f(x) = x² + 2x + 3 ← is in standard form

with a = 1 and b = 2, hence

$x_{vertex}$ = - $\frac{2}{2}$ = - 1

Substitute x = - 1 into f(x) for corresponding value of y

f(- 1) = (- 1)² + 2(- 1) + 3 = 1 - 2 + 3 = 2

vertex = (- 1, 2 )

4 0

3 years ago

Give the slope between the points (-2,3) (-5, -9)

valentina_108 [34]

M = (-9 - 3) / (-5 - -2)
m = -12 / -3
m = 4

The slope is 4.

4 0

2 years ago

Read 2 more answers

Solve the systems using substitution. 1.6x + 2y = -2 4x + y = 1

Schach [20]

$\begin{array}{ccc}(1)\\(2)\end{array}\ \left\{\begin{array}{ccc}6x+2y=-2\\4x+y=1\end{array}\right\\\\4x+y=1\ \ \ |subtract\ 4x\ from\ both\ sides\\y=1-4x\\\\subtitute\ y=1-4x\ to\ (1):\\\\6x+2(1-4x)=-2\\6x+2\cdot1+2\cdot(-4x)=-2\\6x+2-8x=-2\\-2x+2=-2\ \ \ \ |subtract\ 2\ from\ both\ sides\\-2x=-4\ \ \ |divide\ both\ sides\ by\ (-2)\\\boxed{x=2}\\\\subtitute\ the\ value\ of\ x\ to\ the\ y=1-4x:\\\\y=1-4\cdot2\\y=1-8\\\boxed{y=-7}\\\\Answer: \left\{\begin{array}{ccc}x=2\\y=-7\end{array}\right$

6 0

2 years ago

--8x < 32. How can I solve this

Vlada [557]

Answer:

Divide by -8 on both sides. Flip the inequality.

Step-by-step explanation:

You didn't provide any answer choices, but here's how you would solve this:

$-8x < 32\\\\\frac{-8x}{-8} < \frac{32}{-8}\\ \\x > -4$

Notice that because we divided by a negative, the inequality sign must flip in the other direction!

4 0

1 year ago

Will mark brainlist!! help please ​

Will mark brainlist!! help please