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Shtirlitz [24]
3 years ago
13

David and Jim like to race each other for best times. In April, the ratio of David winning to Jim was 5 : 9. In August, the rati

o changed to 10 : 4. If David won 15 races in April, how many races did each brother win in August?
Mathematics
2 answers:
mixer [17]3 years ago
8 0
15: 6 is the answer i got it right so hope it helps
Artemon [7]3 years ago
6 0

15: 6

hope this helps

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In a game, Ben’s score was 3 times Sam’s score. Together they scored 80 points. Find their scores.
Ket [755]

Answer:

PROBABLY ABOUT 27 OR 26.6666666667

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3 years ago
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A farmer has 184 sheep. 23% are ewes. How many rams does have?
Ludmilka [50]

The correct answer is 142

number of sheep= 184

ewe= 23% of total sheep

= 23/100 × 184

= 42 approximately

if number of ewe = 42

Then number of ram= ( total number of sheep - number of ewe)

= 184- 42

= 142 approximately

Therefore, number of of ram is 142

learn more at:

7 0
3 years ago
If f(x) = 3x2 − 8x, 0 ≤ x ≤ 3, evaluate the Riemann sum with n = 6, taking the sample points to be right endpoints.
denis23 [38]

Split up the interval [0, 3] into 6 subintervals,

[0, 1/2], [1/2, 1], [1, 3/2], [3/2, 2], [2, 5/2], [5/2, 3]

The right endpoints are given by the arithmetic sequence,

r_i=0+\dfrac i2=\dfrac i2

with 1\le i\le6.

We approximate the integral of f(x) on the interval [0, 3] by the Riemann sum,

\displaystyle\int_0^3f(x)\,\mathrm dx=\sum_{i=1}^6f(r_i)\Delta x_i

\displaystyle=\frac{3-0}6\sum_{i=1}^6\left(3{r_i}^2-8r_i\right)

\displaystyle=\frac12\sum_{i=1}^6\left(\frac{3i^2}4-4i\right)

\displaystyle=\frac38\sum_{i=1}^6i^2-2\sum_{i=1}^6i

Recall the formulas,

\displaystyle\sum_{i=1}^ni=\frac{n(n+1)}2

\displaystyle\sum_{i=1}^ni^2=\frac{n(n+1)(2n+1)}6

Then the value of the integral is approximately

\displaystyle=\frac38\cdot\frac{6\cdot7\cdot13}6-2\cdot\frac{6\cdot7}2=\boxed{-\frac{63}8}=-7.875

Compare to the exact value of the integral, -9.

7 0
3 years ago
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Ymorist [56]

Answer:

7.6ghjjjssshgvxhjjddaqqsvkseghfshfdee

8 0
3 years ago
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If 3 inches equals 14 feet what is 7 feet in inches
daser333 [38]

Answer:

1.5 inches

Step-by-step explanation:

First you need to divide 3 by 2 because 7 is half of 14 and you would get 1.5 so your answer is 1.5 inches

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3 years ago
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