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melomori [17]
3 years ago
13

Prove 3(x+1)(x+7)-(2x+5)² is never positive

Mathematics
1 answer:
Ede4ka [16]3 years ago
7 0
Hope that's correct ✍︎︎

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Cuanto es 0÷0 necesito ayuda por favor
suter [353]

Answer: El resultado no está definido

no se puede dividir.

8 0
3 years ago
Read 2 more answers
Nancy is replacing the mat on her trampoline. The circular mat has a diameter of 18 feet. what is the area of the trampoline mat
hjlf
Answer : 254 ft sq

A = pi x r^2

A = 3.14 x 81
7 0
2 years ago
Jane spent 3 hours exploring a mountain with a dirt bike. First, she rode 55 miles uphill. After she reached the peak she rode f
Neko [114]

Answer:

Her speed on the summit was 35 mph.

Step-by-step explanation:

Her speed on the summit was "x" mph while her speed while climbing was "x - 10" mph. The distance she rode uphill was 55 miles and on the summit it was 28 miles. The total time she explored the mountain was 3 hours. Therefore:

time uphill = distance uphill / speed uphill = 55 / (x - 10)

time summit = distance summit / speed summit = 28 / x

total time = time uphill + time summit

3 = [55 / (x - 10)] + 28 / x

3 = [55*x + 28*(x - 10)]/[x*(x - 10)]

3*x*(x - 10) = 55*x + 28*x - 280

3x² - 30*x = 83*x - 280

3x²  - 113*x + 280 = 0

x1 = {-(-113) + sqrt[(-113)² - 4*(3)*(280)]}/(2*3) = 35 mph

x2 = {-(-113) - sqrt[(-113)² - 4*(3)*(280)]}/(2*3) = 2.67 mph

Since her speed on the uphill couldn't be negative the speed on the summit can only be 35 mph.

6 0
3 years ago
I WILL GIVE 20 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS AND EXPLAIN WHY THAT IS THE ANSWER
Lubov Fominskaja [6]

Answer:

okay let's start

Step-by-step explanation:

use \: sine \: rule \\  \frac{x}{ \sin(31) }  =  \frac{42}{ \sin(59) }  \:  \: taking \: angle \: at \: c \: as \: 90 \\ x =  \frac{ 42 \sin(31)}{ \sin(59)} \\ x = 25.236146

3 0
2 years ago
What is the completely factored out form of d^4-8d^2+16
Lostsunrise [7]

d^4-8d^2+16

(d^2-4d)(d^2-4d)

(d-2)(d+2)(d-2)(d+2)

Option D is correct

8 0
3 years ago
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