I need help! I don’t understand!

Answers

Answer 1

Answer:

Answer:

Step-by-step explanation:

just coint how much is on each side then multiply it by 3

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Ann entered a race which required a run of 10 km north and a bike of 120 km west. Determine her running speed if she cycled ten times faster than she ran and the total race took her four hours to complete.

Answers

x - running speed
10x - speed on bike

v = s/t
s - distance
t - time

t = s/v

s₁ = 10 km
s₂ = 120 km

$(10)/(x) + (120)/(10x) = 4\n\n(10)/(x) + (12)/(x) = 4\ \ //*x\n\n10 + 12 = 4x\n\n4x = 22\ \ //:4\n\nx =(22)/(4) = 5,5\ km/h$

Solution:
Running speed = 5,5 km/h

How to solve it ...

1. 5-2x²-6x
2. (x+3) (x+4)=0

Answers

$1.\n5-2x^2-6x=0\n-2x^2-6x+5=0\n\na=-2;\ b=-6;\ c=5\n\n\Delta=b^2-4ac\to\Delta=(-6)^2-4\cdot(-2)\cdot5=36+40=76\n\nx_1=(-b-\sqrt\Delta)/(2a)\to x_1=(6-√(78))/(2\cdot(-2))=(6-√(4\cdot19))/(-4)=(6-2√(19))/(-4)=(√(19)-3)/(2)\n\nx_2=(-b+\sqrt\Delta)/(2a)\to x_2=(3-√(19))/(2)$

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$2.\n(x+3)(x+4)=0\iff x+3=0\ \vee\ x+4=0\n\nx=-3\ \vee\ x=-4$

The price of oranges went from $.90 per lb to $1.20 per lb in five years. Find the rate of change of the price of oranges.A) $0.30 per pound per year
B) $0.06 per pound per year
C) $0.24 per pound per year
D) $0.18 per pound per year

Answers

Rate is an expression for a change of some unit per unit of time. For this problem, we find the rate of change of the price by a simple equation which is expressed as:

Rate = change in price / change in time
Rate = ($1.20/lb - $0.90/lb) / 5 yrs - 0
Rate = $0.06 per lb per year

Thus, the answer is B.

What is the solution to this equation?A. x=-4
B. x= 100
C. x= 4
D. x=-100

Answers

Answer:

D. x = - 100

Step-by-step explanation:

$\bold{\frac x5=-20}\n{}\ \ ^(\cdot5\qquad\cdot5)\n\bold{\frac x5\cdot\frac51=-20\cdot5}\n\n\bold{x=-100}$

Write 240000 in standard form

Answers

Final answer:

The standard form of 240000 in arithmetic is 240000 and in scientific notation it is 2.4 x 10^5.

Explanation:

The question is asking to write the given number, 240000, in standard form. In arithmetic, standard form usually refers to writing the number as it normally appears without any mathematical operations involved. However, in scientific notation, the standard form of a number is written as a number between 1 and 10 multiplied by a power of 10. Therefore, the standard form of 240000 in arithmetic is just 240000 whereas in scientific notation it is 2.4 x 10^5.

Learn more about Standard Form here:

brainly.com/question/37011468

#SPJ3

Answer:

240,000

Step-by-step explanation:

standard form means the way you would write it

Please help me! Thanks what is the ratio of a to b?

1/2 = a+b/a-b

A. -3

B. -1/2

C. -1/3

D. 3

Answers

(Cross Multiply)2a+2b=a-b
a=-3b
if b=1; a=-3
correct answer is -3..
Good Luck..

1=a+b. 2=a-b a= 2+b 1=2+b+b. a=2-1/2=3/2 -1=2b b=-1/2 a/b= (3/2)/(-1/2) = (3/2)(-2/1) =-3

Other Questions

Select the correct answer.The elimination method is ideal for solving this system of equations. By which number must you multiply the second equation to eliminate they variable, and what is the solution for this system?x+3y= 422x - y = 14OA. Multiply the second equation by-3. The solution is x= 12, y=9.OB. Multiply the second equation by -2. The solution is x = 12, y=10.OC. Multiply the second equation by 2. The solution is x = 15, y = 9.OD. Multiply the second equation by 3. The solution is x = 12, y = 10.

Please help!!! i’ll give brainless and 10 points if that helps persuade

What is sas congruence?

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