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4 years ago

If 10% of a number is 7, what is 80% of the number?

Mathematics

1 answer:

Zanzabum4 years ago

4 0

Answer:

Step-by-step explanation:

Note that 80% is 8 times 10%.

Thus, we could start with "If 10% of a number is 7" and multiply both quantities by 8: "80% of a number is 56."

Think:

10% of a number is 7,

20% is 14,

50% is 35,

70% is 49, and

80% is 56.

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3 years ago

The sum of a number and its additive inverse is equal to ___.

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The sum of a number and its additive inverse is equal to zero. E.g. an additive inverse of 2 is -2.

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3 years ago

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Jenna is having her birthday party at the ice cream palace. The ice cream party palace charges 2.49 for each ice cream cone

valentina_108 [34]

Answer:

No answer

Step-by-step explanation:

You seemed to have not pisted the whole question. if you need to find the cost of a certain number of cones, use this equation.

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3 years ago

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4. Find the sum of all the numbers from 100 to 199 that are not divisible by 13.

Ierofanga [76]

There are 100 numbers in the range 100-199. Find the smallest and largest multiple of 13 in this range. We have

104 = 8•13

195 = 15•13

so there are 15 - 8 + 1 = 8 multiples of 13 between 100 and 199.

Then the sum we want is

$\displaystyle \sum_{k=100}^{199} k - \sum_{\ell=8}^{15}13\ell$

or equivalently,

(100 + 101 + 102 + … + 199) - 13 (8 + 9 + … + 15)

To compute these sums, recall the following formula:

$\displaystyle \sum_{i=1}^n i = 1 + 2 + 3 + \cdots + n = \frac{n(n+1)}2$

Then

$\displaystyle \sum_{k=100}^{199} k = \sum_{k=1}^{199} k - \sum_{k=1}^{99} k = \frac{199\cdot200}2 - \frac{99\cdot100}2 = 14,950$

and

$\displaystyle \sum_{\ell=8}^{15} 13\ell = 13 \left(\sum_{\ell=1}^{15} \ell - \sum_{\ell=1}^7 \ell\right) = 13 \left(\frac{15\cdot16}2 - \frac{7\cdot8}2\right) = 1,196$

which means the sum we want is 14,950 - 1,196 = 13,754.

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2 years ago

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olya-2409 [2.1K]

Answer:

where's the options

Step-by-step explanation:

i think you made a mistake

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3 years ago

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