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3 years ago

Please answer both parts

Mathematics

2 answers:

tiny-mole [99]3 years ago

7 0

A) each lamp would cost $14

B) He would spend $126 on 9 lamps

Verdich [7]3 years ago

5 0

Answer:

each lamp would cost $14

He would spend $126 on 9 lamps

Step-by-step explanation:

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Answer:

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3 years ago

What is the unit rate of 2,16 and 4,32

SIZIF [17.4K]

Answer:

( 1/2 0.5 mph )

Step-by-step explanation:

In a unit rate, the denominator is always 1. So, to find unit rate, divide the denominator with the numerator in a way that the denominator becomes 1.

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3 years ago

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DerKrebs [107]

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Step-by-step explanation:

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3 years ago

Read 2 more answers

*FIRST ANSWER GETS BRAINLIEST*

svet-max [94.6K]

The other solution to the equation is -3.

Step-by-step explanation:

Given equation is;

5x²+bx+12=0

One solution is -4/5

We will put this solution in Eqn to get the value of b first,

$5(\frac{-4}{5})^2+b(\frac{-4}{5})+12=0\\5(\frac{16}{25})+(\frac{-4b}{5})+12=0\\\frac{16}{5}-\frac{-4b}{5}=-12\\$

Multiplying each term by 5

$5*(\frac{16}{5})-\frac{-4b}{5}*5=-12*5\\16-4b=-60\\-4b=-60-16\\-4b=-76$

Dividing both sides by -4

$\frac{-4b}{-4}=\frac{-76}{-4}\\b=19$

Putting b=19 in given Eqn

5x²+19x+12=0

Here,

a=5 , b=19 , c=12

Using quadratic formula,

$x=\frac{-b\±\sqrt{b^2-4ac}}{2a}\\x=\frac{-(19)\±\sqrt{(19)^2-4(5)(12)}}{2(5)}\\\\x=\frac{-19\±\sqrt{361-240}}{10}\\\\x=\frac{-19\±11}{10}\\$

Either, or,

$x=\frac{-19+11}{10},\ \ \ \ \ \ x=\frac{-19-11}{10}\\x=\frac{-8}{10},\ \ \ \ \ \ \ \ \ x=\frac{-30}{10}\\x=\frac{-4}{5},\ \ \ \ \ \ \ \ \ \ x= -3$

The other solution to the equation is -3.

Keywords: linear equation, quadratic formula

Learn more about quadratic formula at:

#LearnwithBrainly

6 0

3 years ago

Please help find angle!!

Paraphin [41]

Answer:

35.5

Step-by-step explanation:

H, A

Cos=A/H

Cos 65= 15/x

x=15/cos 65

8 0

3 years ago