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2 years ago

Brian scored 120 on his test the first time he took the test. The second time he took the test,

Mathematics

2 answers:

Brums [2.3K]2 years ago

6 0

Answer:

b. 25%

Step-by-step explanation:

(new - old)/ old * 100%

150 - 120 = 30 ... 30/120 = .25 * 100% = 25%

Kruka [31]2 years ago

5 0

Answer:

25% increase

Step-by-step explanation:

Take the new amount and subtract the original amount

150-120

Divide this by the original amount

30/120

1/4

.25

Multiply by 100%

25%

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2 years ago

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2 years ago

Find the approximate area between the curve f(x) = -4x² + 32x and on the x-axis on the interval [0,8] using 4 rectangles. Use th

Doss [256]

Split up the interval [0, 8] into 4 equally spaced subintervals:

[0, 2], [2, 4], [4, 6], [6, 8]

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Find the values of the function at these endpoints:

$f(r_i)=-4{r_i}^2+32r_i=-16i^2+64i$

The area is given approximately by the Riemann sum,

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$\displaystyle2\sum_{i=1}^4(-16i^2+64i)=-32\sum_{i=1}^4i^2+128\sum_{i=1}^4i=-32\cdot\frac{4\cdot5\cdot9}6+128\cdot\frac{4\cdot5}2=\boxed{320}$

where we use the formulas,

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2 years ago