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TiliK225 [7]
2 years ago
10

Can someone help me do 13, 14 and 15 thank u

Mathematics
1 answer:
sweet [91]2 years ago
8 0

Answer:

Step-by-step explanation:

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A pen and a ruler cost $2.10. 2 such pens and 3 such rulers cost $4.90. Find the cost of one ruler.
hammer [34]

The cost of one ruler is $0.70

<h3>Applications of simultaneous equations </h3>

From the question, we are to determine the cost of one ruler

Let x represent the cost of a ruler

and

y represent the cost of a pen

From the given information, we can write that

y + x = $2.10 ----------- (1)

2y + 3x = $4.90  ----- (2)

From equation (1),

y + x = $2.10

Then,

y = $2.10 - x

Substitute this into equation (2)

2y + 3x = $4.90

2($2.10 - x) + 3x = $4.90

$4.20 - 2x + 3x = $4.90

$4.20 +x = $4.90

x = $4.90 - $4.20

x = $0.70

Hence, the cost of one ruler is $0.70

Learn more on Simultaneous equations here: brainly.com/question/26310043

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3 0
2 years ago
Given the quadratic function y=(3x−2)(x+4), what are the x-intercepts?
Bess [88]

Answer:

(\frac{2}{3} , 0), (-4, 0)

Step-by-step explanation:

Substitute 0 for y and solve to find the x-intercept.

8 0
2 years ago
Which set of numbers can represent the side lengths, in millimeters, of an obtuse triangle?
olga_2 [115]

The answer is actually A.

3 0
3 years ago
Read 2 more answers
Mary Beth wants to save $175 for a trip to an amusement park. She sets aside $14 of her allowance at the end of each week. How m
scoray [572]

Answer:

Approximately 13 weeks

Step-by-step explanation:

GIven data

Amount to be save= $175

Weekly allowance = $14

Hence the number of weeks it will take to save $175 is given as

=175/14

=12.5

Therefore the number of weeks is approximately 13 weeks

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2 years ago
Sean borrowed some money from his friend in order to help buy a new video game system. Sean agreed to pay back his friend $10 pe
aliya0001 [1]

Answer: (10)9

Step-by-step explanation:

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3 years ago
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