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3 years ago

Wha is nine less than an unknown number equals 15

Mathematics

2 answers:

astra-53 [7]3 years ago

7 0

24 is the missing number

Tanya [424]3 years ago

3 0

X - 9 = 15
-9 = 15 - x
-9 - 15 = - x
-24 = -x
x = 24

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Delivery service a charges 10 for a pickup and 0.10 per mile delivery service b charges 0.25 per mile at how many miles is the c

sukhopar [10]

<h2>At 67 miles, cost of the two services is the same</h2><h3><u>Solution:</u></h3>

Given that,

<em><u>Delivery service A charges 10 for a pickup and 0.10 per mile</u></em>

Let "x" be the number of miles

Therefore,

Cost = 10 + 0.10(number of miles)

Cost = 10 + 0.10x ----- eqn 1

<em><u>Delivery service b charges 0.25 per mile </u></em>

Therefore,

Cost = 0.25(number of miles)

Cost = 0.25x ------ eqn 2

<em><u>At how many miles is the cost of the two services the same</u></em>

Eqn 1 = eqn 2

10 + 0.10x = 0.25x

0.25x - 0.10x = 10

0.15x = 10

Divide both sides by 0.15

$x = 66.66 \approx 67$

Thus at 67 miles, cost of the two services is the same

8 0

4 years ago

Josie is making pizza dough. Complete the double number line by filling in the missing values. Then write an equation that model

coldgirl [10]

Answer:

First part:

To complete the top number line use the numbers

$1\dfrac{1}{2}$

and

$2\dfrac{1}{4}$

To complete the bottom number line use the numbers:

3, and

Second part:

The relationship between the total cups of flour, c, and number of batches n, is:

$c=\dfrac{3}{4}n$

Explanation:

Find the complete question if the file attached.

First part.

The number line on top shows the number of cups of flour, c.

Each mark corresponds to 3/4 of cups. Thus the numbers that complete the number line are:

$\dfrac{3}{4}+\dfrac{3}{4}=\dfrac{6}{4}=\dfrac{4}{4}+\dfrac{2}{4}=1+\dfrac{1}{2}=1\dfrac{1}{2}$

$1\dfrac{1}{2}+\dfrac{3}{4}=1+\dfrac{1}{2}+\dfrac{3}{4}=\dfrac{4}{4}+\dfrac{2}{4}+\dfrac{3}{4}=\dfrac{9}{4}=\dfrac{8}{4}+\dfrac{1}{4}=2+\dfrac{1}{4}=2\dfrac{1}4}$

The the two numbers that complete the top number line are:

$1\dfrac{1}{2}$

and

$2\dfrac{1}{4}$

The bottom number line models the number of batches of dough, n.

Each mark corresponds to one unit, i.e. one batch.

Thus, the missing values are:

2 + 1 = 3, and

3 + 1 = 4.

Second part. Find the relationship between the total cups of flour, c, and number of batches n.

The relationship is indicated by the marks that are at equivalent position:

You can notice that you must multiply the number of batches, n, by 3/4 to get the number of cups of flour, c, that correspond to the same position:

For instance:

$1\times \dfrac{3}{4}=\dfrac{3}{4}$

$4\times \dfrac{3}{4}=3$

Therefore,

$c=\dfrac{3}{4}n$

5 0

3 years ago

Help find the measure of the angle indicated!!!?

Alecsey [184]

Answer:

50°

Step-by-step explanation:

$m\angle RST = \frac{1}{2} \times (150\degree - 50\degree) \\\\m\angle RST = \frac{1}{2} \times 100\degree \\\\ \purple{ \bold{m\angle RST =50\degree}} \\\\$