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3 years ago

I need help on this question? Can you please show the working out

Mathematics

2 answers:

snow_tiger [21]3 years ago

6 0

Answer:

2×5=1000000000

Step-by-step explanation:

1000000000

MAXImum [283]3 years ago

5 0

You need to use pythagorean theorem to figure out BD as you need the height of the triangles to figure out the area. to figure out the area of a triangle the formula is: area of triangle = 1/2 x base x height
i don’t know if you’re supposed to change the values they give you into numbers but i’m changing them
2 √ 5 = 4.47 cm
3 √ 2 = 4.24 cm
√ 2 = 1.41 cm

using pythagorus to work out BD
BD² = 4.47 ² - 4.24 ²
BD² = 2.0033
BD = √2.0033
BD = 1.42 cm

to figure out area of triangle ABD
1/2 x 4.24 x 1.42 = 3.0104 cm ²

area of BDC
1/2 x 1.41 x 1.42 = 1.0011 cm ²

total area of triangle
3.0104 + 1.0011 = 4.0115 cm ²

my answer may differ from the actual answer as the rounding will be different. i recommend you just follow my working out and but not round your numbers at the end of each step to get a more accurate answer

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The quotient of n and 7 is 39

Scorpion4ik [409]

Let n = the unknown number.

Quotient tells you use division.

n/7 = 39

Multiply both sides by 7 to cancel out the number in the denominator and isolate the variable.

n = 39(7) = 273

n = 273

4 0

3 years ago

3(a - 1) + 2a = a + 1

tresset_1 [31]

Answer:

a = 1

Step-by-step explanation:

Step 1: Write equation

3(a - 1) + 2a = a + 1

Step 2: Solve for a

Distribute 3: 3a - 3 + 2a = a + 1

Combine like terms: 5a - 3 = a + 1

Subtract a on both sides: 4a - 3 = 1

Add 3 on both sides: 4a = 4

Divide both sides by 4: a = 1

7 0

3 years ago

A survey of 80 homes in a Washington D.C. suburb showed that 45 were air conditioned. A sample of 120 homes in a Pittsburgh subu

Karo-lina-s [1.5K]

Answer:

There is no significant difference between the two proportions

Step-by-step explanation:

State the hypotheses:

Null hypothesis -> H0: P1 = P2

Alternative hypothesis -> H1: P1 not = P2

Note that hypotheses constitute a two-tailed test. the null hypothesis will be rejected if the proportion from population 1 is too big or if it is too small.

Formulate an analysis plan

For the analysis, the significance level is 0.05. The test method is a two-proportion z-test.

Analyze sample data.

Using sample data we calculate the pooled sample porportion (p) and the standard error (SE). Using those measures, we compute the z-score test statistic (z).

p = (p1*n1 + p2*n2)/(n1 + n2)

p1 = 45/80 = 0.5625

p2 = 63/120 = 0.525

n1 = 80

n2 = 120

p = (0.5625*80 + 0.525*120)/(80 + 120)

p = 0.54

$SE = \sqrt{p*(1-p)*(\frac{1}{n_{1} } +\frac{1}{n_{2}} )}$

$SE = \sqrt{(0.2428)*(0.0125 + 0.0083)}$

SE = 0.07112

z = (p1 - p2)/ SE

z = (0.5625 - 0.525)/0.07112

z = 0.527

For z = 0.527 we have p-value 0.198

Interpret results. Since p - Value (0.198) of the test is greater than the alpha-0.05 (For two tailed test α-0.025). Therefore we cannot reject the null hypothesis.

There is no significant difference between the two proportions

5 0

3 years ago

6+8(y-3/5), if y=8/9

skad [1K]

374/45 is the answer

4 0

3 years ago

Read 2 more answers

Jose found a beach ball in his garage. He wants to know how much plastic was used to

Serjik [45]

Answer:

about 616 in²

Step-by-step explanation:

The area of a sphere is given by ...

A = πd²

For a ball 14 inches in diameter, the area is ...

A = π(14 in)² = 196π in²

A ≈ 616 in²

The area of the required plastic is about 616 square inches.

4 0

3 years ago