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3 years ago

Solve for r. –10r = 4 − 9r

Mathematics

2 answers:

weeeeeb [17]3 years ago

5 0

The answer to the variable r is r=-4

Eduardwww [97]3 years ago

3 0

Answer:

r = -4

Step-by-step explanation:

–10r = 4 − 9r

Add 9r to each side

–10r+9r = 4 − 9r+9r

-r = 4

Multiply each side by -1

-1 *-r = 4 *-1

r = -4

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2 years ago

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3 years ago

(1 pt) What is the measure of ∠Z? A. 57° B. 65° C. 94° D. 115°

Anestetic [448]

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3 years ago

Read 2 more answers

James has eight coins in his pocket. All the coins are either dimes or quarters.The total value of the coins is $1.25. How many

Goshia [24]

Answer:

he has 5d+3q

Step-by-step explanation:

since every d is .10 and every q is .25 the equation can be changed to 5(.10)+3(.25) which is equal to .5+.75 which adds up to 1.25

i did this by assuming that the amount of d is 8 at first, then change one of the 8 d to a q which will give you 7d+q, then assume another d is a q which will give you 6d+2q, repeat this until the amount of d and q add up to 1.25

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3 years ago

One person can do a certain job in 15 minutes and another person can do the same job in 30 minutes. How many minutes will it tak

Flauer [41]

Hello! Your answer is B, 10 minutes.

Say the x = minutes taken to do the job. You can set up an equation like this to solve this.

$\frac{1}{15} x + \frac{1}{30} x = 1$

This is representative of the situation. The fractions each represent how much each person does in a minute, and when they're multiplied by x, that's how much of the project they get done based off of the minutes they work together on the job. Add the two together, and you get how much of the project is finished in x amount of time. Set it equal to 1, as you are looking for 100% completion.

Once you have this equation, find a common denominator, add, and solve.

$\frac{1}{15} x + \frac{1}{30} x = 1$

$\frac{2}{30} x + \frac{1}{30} x = 1$

$\frac{3}{30}x = 1$

$\frac{1}{10}x = 1$

$x = 10$

Therefore, it will take them 10 minutes to do the job together.

Hope this helps!

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3 years ago