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spin [16.1K]
3 years ago
13

A rock is tossed over a seaside cliff. The equation y=−16x^2+50x+118 gives the height of a rock above sea level. How long until

the rock hits the water?
Mathematics
1 answer:
Karolina [17]3 years ago
8 0
I don’t know I just want to get points but good luck
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Can someone help me with factoring by grouping
Wittaler [7]

Factor : x^2+3x-10

Answer = (x - 2)(x + 5)

Explanation:

Y = x^2 + 3x - 10.

Find 2 numbers knowing sum (3) and product (-10).

Factor pairs of (-10) -> (-1, 10)(-2, 5). This sum is 3 = b. The 2 numbers are: -2 and 5.

y = (x - 2)(x + 5).

6 0
3 years ago
Read 2 more answers
Can someone answer these questions ? thank you
Naya [18.7K]

Answer:

Step-by-step explanation:

12a)To rationalize the denominator, multiply the denominator and numerator by √5.

\frac{15}{\sqrt{5}}=\frac{15*\sqrt{5}}{\sqrt{5}*\sqrt{5}}\\\\=\frac{15\sqrt{5}}{5}\\\\=3\sqrt{5}

b) (a+b)² = a² + 2ab + b²

(1 +√3)² = 1² + 2*1*√3 + (√3)²

= 1 + 2√3 + 3

= 4 + 2√3

a = 4 ; b =2

13) (a + b)(a - b) = a² - b²

\frac{(6-\sqrt{5})(6+\sqrt{5})}{\sqrt{31}}=\frac{6^{2}-(\sqrt{5})^{2}}{\sqrt{31}}\\\\ =\frac{36-5}{\sqrt{31}}\\\\=\frac{31}{\sqrt{31}}\\\\=\frac{31*\sqrt{31}}{\sqrt{31}*\sqrt{31}}\\\\=\frac{31\sqrt{31}}{31}\\\\=\sqrt{31}

5 0
3 years ago
How to do this pls:( using PEMDAS
Kryger [21]

Answer: x y

-2 15

-1 9

0 7

1 9

2 15

3 25

Step-by-step explanation:you always do the exponent first, then you multiply that by that two, and then you add 7.

7 0
3 years ago
Not sure what it is, does anyone know?
patriot [66]

Answer:

110 degrees

Step-by-step explanation:

it is 110 degrees because on a line comebinedt is 180 degrees. And you already ahve one side which is 70 degrees. So 180 minus 70 is 110 degrees.

7 0
3 years ago
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Please help I’ll make you a branliest!!!!!!!
masya89 [10]

Answer:

2 answer is right

Step-by-step explanation:

I think

7 0
3 years ago
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