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4 years ago

Stuck i need help please

Mathematics

1 answer:

vova2212 [387]4 years ago

6 0

Use the formula for compound interest.
A = P(1 +r)^t
Fill in the given values and do the arithmetic.
A = 3100(1+.035)^9
A = 4224.98

After 9 years, the investment will be worth $4,225.

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The perimeter of the triangle is 37 cm. The lengths of the triangle are 3x, 2(x+4) and 2x+1. What is the value of x?

enot [183]

Answer:

Step-by-step explanation:

3x + 2(x + 4) + 2x+1 = 37 Remove the brackets.

3x + 2x + 8 + 2x + 1 = 37 Collect like terms

7x + 9 = 37 Subtract 9 from both sides

7x + 9-9 = 37 - 9 Combine

7x = 28 Divide by 7

7x / 7 = 28/7

x = 4

5 0

3 years ago

Can y'all answer this please

Svetlanka [38]

Answer:

Step-by-step explanation:

8 0

3 years ago

What is the x-intercept of the equation 7x + 3y = 21? (0, 3) (0, 7) (3, 0) (7, 0)

notka56 [123]

Answer:

(3, 0)

Step-by-step explanation:

we have

$7x+3y=21$

we know that

The x-intercept is the value of x when the value of y is equal to zero

For y=0

substitute in the equation and solve for x

$7x+3(0)=21$

$7x=21$

Divide by 7 both sides

$x=3$

therefore

The x-intercept is the point (3,0)

5 0

3 years ago

Read 2 more answers

Can anyone help me out with these two questions ? much appreciated <3

alexira [117]

Answer:

13. A

14. D

Step-by-step explanation:

A. Horizontal shift right 4, vertical shift up 1, vertical stretch 3

D. Horizontal shift left 3, vertical shift up 6, vertical shrink 1/2, reflection across the x-axis

8 0

3 years ago

The estimate of the population proportion should be within plus or minus 0.02, with a 90% level of confidence. The best estimate

Rudiy27

Answer:

The sample size required is 910.

Step-by-step explanation:

The confidence interval for population proportion is:

$CI=\hat p\pm z_{ \alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n} }$

The margin of error is:

$MOE=z_{ \alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n} }$

Given:

$\hat p = 0.16\\MOE= 0.02\\Confidence\ level =0.90$

The critical value of z for 90% confidence level is:

$z_{\alpha /2}=z_{0.10/2}=z_{0.05}=1.645$ *Use a standard normal table.

Compute the sample size required as follows:

$MOE=z_{ \alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n} }\\0.02=1.645\times \sqrt{\frac{0.16(1-0.16)}{n} }\\n=\frac{(1.645)^{2}\times 0.16\times (1-0.16)}{(0.02)^{2}} \\=909.2244\\\approx910$

Thus, the sample size required is 910.

5 0

4 years ago