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r-ruslan [8.4K]
1 year ago
7

Devika buys 30 notebooks and 15 pens. Each book costs Rs40 and that of each pen is Rs15. Find out the total amount she spent.

Mathematics
1 answer:
Rudiy271 year ago
5 0

Answer:

Rs 1425

Step-by-step explanation:

=(30×40) + (15×15)

=1425

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What is five billion two hundred fifty four million seventy one thousand nine hundred twenty six written in standard form
lakkis [162]

5,254,071,926

Is the standard form

4 0
3 years ago
What are the slope and y-intercept for the graph of y – 3x = -1?
Liula [17]

Answer:

Slope (m) = 3, y-intercept (b) = -1

Step-by-step explanation:

First, we need to write the equation in y = mx + b.

To do this, add 3x to both sides.

y = 3x - 1 is your result.

Now, we have everything we need to do determine our slope and y-intercept in just this equation alone.

Remember, m = slope and b = y-intercept.

In this equation:

m = 3

b = -1

So your slope is 3, and your y-intercept is -1

5 0
2 years ago
Solve 9x^2- 17x- 85 = 0 Give your solutions correct to 3 significant figures.​
dybincka [34]

Answer:

x =\frac{17}{18} +\frac{1}{18} \sqrt{3349} OR x =\frac{17}{18} +\frac{-1}{18} \sqrt{3349}

Step-by-step explanation:

9x2−17x−85=0

For this equation: a=9, b=-17, c=-85

9x2+−17x+−85=0

Step 1: Use quadratic formula with a=9, b=-17, c=-85.

x =\frac{-b + \sqrt{b^{2}-4ac } }{2a}

x  =\frac{-(-17)+\sqrt{(-17)^{2} -4(9)(-85)} }{2(9)}

x =\frac{17}{18} +\frac{-1}{18} \sqrt{3349}

4 0
2 years ago
Number 7, please help me
MariettaO [177]

Answer:

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Step-by-step explanation:

4 0
2 years ago
Write an equation in point-slope form for the line that has a slope of 4/5 and contains the point (−5, −3).
ankoles [38]

y = mx + b, where m = slope, and b = y-intercept.

Since you are not given the y-intercept, you have to solve for it through the equation, y = (4/5)x (which is the slope you are given) + b, and replace x and y with values given, which are (-5,-3)

y = (4/5)x + b

-3 = (4/5)(-5) + b

-3 = -4 + b

1 = b


Then replace b in the first equation to get the answer

y = (4/5)x + 1

5 0
3 years ago
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