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3 years ago

6

Mabel bought towels at 3 for $10 and toothbrushes at 5 for $9. She paid $87 for 18 towels and some toothbrushes. How many toothb

rushes did she buy?
pls help! thx

2 answers:

gtnhenbr [62]3 years ago

7 0

She bought 15 toothbrushes!

Goryan [66]3 years ago

4 0

She bought 15 toothbrushes.

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Hello I really need help. Thanks :)

BARSIC [14]

Answer:

y + 1 = 4/3(x - 9)

Step-by-step explanation:

Point-slope form: y - y₁ = m(x - x₁)

Substitute the numbers into the equation:

y - (-1) = 4/3(x - 9)

y + 1 = 4/3(x - 9)

7 0

3 years ago

A steel ball is dropped from a building’s roof and passes a window, taking 0.125 s to fall from the top to the bottom of the win

Anna35 [415]

Answer:

20.425 m

Step-by-step explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

$s=ut+\frac{1}{2}at^2\\\Rightarrow u=\frac{s-\frac{1}{2}at^2}{t}\\\Rightarrow u=\frac{1.2-\frac{1}{2}\times 9.81\times 0.125^2}{0.125}\\\Rightarrow u=8.98\ m/s$

Now this will the final velocity when it reaches the top of the window

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{8.98^2-0^2}{2\times 9.81}\\\Rightarrow s=4.11\ m$

$v=u+at\\\Rightarrow v=8.98+9.81\times 0.125\\\Rightarrow v=10.21\ m/s$

If the upward flight is an exact reverse of the downward flight then the time taken while going down will be 1 second and going up will be 1 second.

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=10.21\times 1+\frac{1}{2}\times 9.81\times 1^2\\\Rightarrow s=15.115\ m$

Hence total height of the building is 4.11+1.2+15.115 = 20.425 m

4 0

3 years ago

The mayor of a town receives 75% of the votes in a town election. If 680 people voted, how many votes did the mayor receive? 360

7nadin3 [17]

First you need to put everything as 1 unit. I'll convert both to fractions for now.
75% = 3/4

680/1 * 3/4

Cross Multiply

2040/4

Simplify

510

The mayor received 510 votes.

5 0

3 years ago

Pls help I’ll give brainliest

MrMuchimi

Answer:

A. 4 + 4.5 + 3.5 + 3m = 30

Explanation:

Josies's goal = 30 miles each week

She already ran 3 days of the week which leaves us 4 more days

7 - 3 = 4

She said she wanted to have a day off to rest

4 - 1 = 3

which brings us to 3 days left to finish her goal

3m (where 'm' is the miles she'll be running each day)

5 0

3 years ago

30 students in a class took an algebra test.

lesya [120]

Answer:

70%

Step-by-step explanation:

21/30 p/100

30/30=2,100/30=70

5 0

3 years ago