T multiplied 3/4 for t= 8/9

Answers

Answer 1

Answer:

Answer: 2/3 or 0.6

Step-by-step explanation:

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Simplify (7x+3y²) and (4xy²)

Answers

Answer:

can't can't be simplified .

Step-by-step explanation

Matthew and Andrew leave an intersection atthe same time. Matthew travels due east
at 30 mph and Andrew travels due south at
40 mph. If nothing causes either to stop for
any reason how far apart are they after
1 hour?

Answers

d i believe so it might be d if not i’m sorry

two nascar cars are racing around a 2 mile track. one car can complete a lap in 48 seconds, and the other car can complete one lap in 40 seconds. if they start side by side, after how much time will they be side by side again

Answers

First we need to find the speed of each car using the formula

$s=(d)/(t)$ , where s is the speed, d is the distance and t is time.

$s=(2)/(48)=0.0417 miles/s$

$s=(2)/(40) = 0.05miles/s$

Since they are moving in the same direction we subtract the speeds to obtain relative velocity, $V_r$

$V_r = 0.05-0.0417= 0.0083 miles/s$ , then

$t=(2)/(0.0083)= 240s$ . This is the time it takes for the fastest car to complete an extra lap relative to the slower car.

Solve by completing the square: x^2-2x-1=0

Answers

$(a-b)^2=a^2-2ab+b^2\ (*)\n------------------------------\n\nx^2-2x-1=0\n\nx^2-2x\cdot1=1\n\n\underbrace{x^2-2x\cdot1+1^2}_((*))-1^2=1\n\n(x-1)^2-1=1\n\n(x-1)^2=1+1\n\n(x-1)^2=2\Rightarrow x-1=-\sqrt2\ \vee\ x-1=\sqrt2\n\n\underline{\underline{x=1-\sqrt2\ \vee\ x=1+\sqrt2}}$

Formula for finding the line of symmetry of a quadratic function?

Answers

It is a vertical line with the equation of x = -b/2a.

It is the line of symmetry of a parabola and divides a parabola into two equal halves that are reflections of each other about the line of symmetry. It intersects a parabola at its vertex. It is a vertical line with the equation of x = -b/2a.

Gloria earns 1.5 times her normal hourly pay for each hour that she works over 40 hours in a week. Here normal pay is $9.70 per hour. Last week Gloria earned $489.85 How many hours did she work last week?

Answers

She earns ($9.70x40) for a 40 hour week=$388
She earned $489.85-$388 extra= $101.85
She gets paid $9.7x1.5 for every extra hour=$14.55
She worked $101.85/$14.55 hours extra=7hours
She worked 7+40 hours that week=47 hours

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Which of the following best describes the algebraic expression 15x+8