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Zarrin [17]
3 years ago
10

Can someone please help me

Mathematics
1 answer:
xenn [34]3 years ago
6 0

Answer:

60:45 =12:9 =4:3 so the answer is 4:3

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A car is traveling at a speed of 20 meters per second. What is the cars speed in kilometers per hour
IRISSAK [1]

Answer:

72 km/h

Step-by-step explanation:

We need to convert units

so:

20 m    -----  1 km -------- 3600 s

1 s         -----  1000 m ----1 h

and solve ot

20 x 1 x 3600 s = 72000  we multiply  numerators

1s x 1000 m x 1 h = 1000  we multiply denominators

we divide de results 72000/1000 = 72

4 0
3 years ago
Sital says that 2.5cm³ is the same as 25mm³. Is she right?​
DanielleElmas [232]
Sital is right
This is because there are 10mm in a cm so therefore you would times 2.5cm by 10 to get 25mm
7 0
2 years ago
Read 2 more answers
Calcium is an essential nutrient for strong bones and for controlling blood pressure and heart beat. Because most of the body’s
irakobra [83]

Answer:

No, because the 95% confidence interval contains the hypothesized value of zero.

Step-by-step explanation:

Hello!

You have the information regarding two calcium supplements.

X₁: Calcium content of supplement 1

n₁= 12

X[bar]₁= 1000mg

S₁= 23 mg

X₂: Calcium content of supplement 2

n₂= 15

X[bar]₂= 1016mg

S₂= 24mg

It is known that X₁~N(μ₁; σ²₁), X₂~N(μ₂;δ²₂) and σ²₁=δ²₂=?

The claim is that both supplements have the same average calcium content:

H₀: μ₁ - μ₂ = 0

H₁: μ₁ - μ₂ ≠ 0

α: 0.05

The confidence level and significance level are to be complementary, so if 1 - α: 0.95 then α:0.05

since these are two independent samples from normal populations and the population variances are equal, you have to use a pooled variance t-test to construct the interval:

[(X[bar]₁-X[bar]₂) ± t_{n_1+n_2-2;1-\alpha /2} * Sa*\sqrt{\frac{1}{n_1} +\frac{1}{n_2} }]

t_{n_1+n_2-2;1-/2}= t_{25;0.975}= 2.060

Sa= \sqrt{\frac{(n_1-1)S^2_1+(n_2-1)S^2_2}{n_1+n_2-2} }= \sqrt{\frac{11*529+14*576}{12+15-2} } = 23.57

[(1000-1016)±2.060*23.57*\sqrt{\frac{1}{12} +\frac{1}{15} }]

[-34.80;2.80] mg

The 95% CI contains the value under the null hypothesis: "zero", so the decision is to not reject the null hypothesis. Then using a 5% significance level you can conclude that there is no difference between the average calcium content of supplements 1 and 2.

I hope it helps!

3 0
3 years ago
Help me with geometry please
mafiozo [28]
If I was doing it I would split the parallelogram in half, and find the area of half of the shape and that should give you your answer. I'm so sorry if I'm wrong
7 0
4 years ago
If Aiden had 30 apples in total and had 3 bag's how many apples would be in each bag ?
IrinaK [193]

Answer:

10

Step-by-step explanation:

30/3 = 10

If all bags have the same number of apples, then each bag has 10 apples.

Answer: 10

8 0
2 years ago
Read 2 more answers
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