Can someone help please?!

Mathematics

2 answers:

lukranit [14]4 years ago

8 0

What 2 numbers muliply to get -30 and add to get 7?
-3 and 10

(x-3)(x+10) is da answer

C is answer

Minchanka [31]4 years ago

4 0

X² + 7x - 30
x² + 10x -3x - 30
x(x+10) - 3(x+10)
(x-3)(x+10)

Answer is C

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Complete the general form equation of the parabola that passes through (4, -11) with vertex at : (2, -3).

fomenos

Answer:

Step-by-step explanation:

You're given a coordinate in the form of (x, y) and you're also given the vertex in the form of (h, k). We will use those in the vertex form of the equation

$y=a(x-h)^2+k$ and solve for a. Filling in:

$-11=a(4-2)^2-3$ which simplifies a bit to

$-11=a(2)^2-3$ and a bit more to

$-11=4a-3$ . Add 3 to both sides to get

-8 = 4a so

a = -2

The equation, then, is

$y=-2(x-2)^2-3$

7 0

3 years ago

dexar [7]

Answer:

The interval [25, 35] has the slowest average rate of decay.

Step-by-step explanation:

The number of grams in a sample of radium is represented by the function $r(t) = 50\cdot e^{-0.013\cdot t}$ , which is a monotonous decreasing function. Hence, the greater the values of $t$ , the slowest the average rate of decay, represented by a secant line. The interval [25, 35] has the slowest average rate of decay.