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3 years ago

If a + b = 7 and b=3, what is 4a A. 20b B. 17a C. 16 D.20

Mathematics

2 answers:

Ratling [72]3 years ago

4 0

Answer:

$\huge \colorbox{red}{ \boxed{ \blue{ \sf}{c.16}}}$

Step-by-step explanation:

in this Question, you have to plug the value for b  into a+b=7 in order to find a:

a+b=7
a+3=7
a=4

once you know that a=4, just substitute into 4a:

4×4=16

evablogger [386]3 years ago

3 0

C 16 because a is 4 and 4 times 4 is equal to 16

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Line AB contains points A (0, 1) and B (1, 5). The slope of line AB is A. -4 B. -1/4 C. 1/4 D. 4

il63 [147K]

Slope is rise over run so since it rose 4 and went 1 to the right the slope would be 4 because 4/1=4 P.S. The actual formula for slope is y2-y1 over x2-x1 so it would be 5-1/1-0 which again is 4/1

6 0

3 years ago

Is it likely that the next 50 Sunday customers will spend an average of at least $40? Explain. Choose the correct answer below

Brrunno [24]

Answer:

B. Yes it is likely. The probability that the next 50 Sunday customers will spend an average of at least $40 is P=0.0023.

Step-by-step explanation:

The question is incomplete:

A grocery store’s receipts show that Sunday customer purchases have a skewed distribution with a mean of $32 and a standard deviation of $20.

We have to assume certain conditions to calculate the probability that the next 50 Sunday customers will spend an average of at least $40.

First, this 50 purchases are representative of the total purchases made in the store (the same as saying it is a random sample).

Second, the 10% condition: the 50 sales represent less than 10% of all purchases.

Third, the sample of 50 sales is large enough to make an approximation to the normal distribution.

If all these conditions are met, we can approximate the probabiltity that the next 50 Sunday customers will spend an average of at least $40.

We have a sampling distribution, with mean 32 (equal to the population mean) and standard deviation:

$\sigma_M=\dfrac{20}{\sqrt{50}}=\dfrac{20}{7.07}=2.83$

Then, we calculate the z-score

$z=\dfrac{X-\mu_M}{\sigma_M}=\dfrac{40-32}{2.83}=\frac{8}{2.83} =2.83$

The probabilty can be calculated then as:

$P(X_{50}>40)=P(z>2.83)=0.0023$

5 0

3 years ago

2n+7+7n=13+3n+8n please help

Rasek [7]

first combine like terms so 2n + 7n which is 9n

so 9n + 7 = 13 + 3n + 8n

then combine on other side so 9n + 7 = 13 + 11n

then subtract 7 to 13 so 6

sp 9n + 6 = 11n

then subtract 9 to the other side so 2n

6 = 2n then divide all by 2

n= 3

3 0

3 years ago

Read 2 more answers

A pair of $195 boots are discounted 40% If the boots are reduced in price by an additional 66 2/3% what will the discount price

UNO [17]

First, find the 40% discount.
40% of 195 is 78
195 x 0.40 = 78
Subtract that from 195
195 - 78 = 117
Now, find 66 2/3% of 117, since it is an additional reduction after the original discount.
2/3 = 0.667, so 66 2/3% is 66.667%
117 x 0.66667 = 78.00039
And subtract that from 117
117 - 78.00039 = 38.99961, which in dollars would be $38.99. (hundredths, etc. of a cent are usually just dropped; no rounding involved.)
The discount price would then be $38.99

4 0

4 years ago

Read 2 more answers

98.75 + 5% sales tax

jolli1 [7]

Answer:

103.69

Step-by-step explanation:

5% of 98.75 is about 4.94. So if you were to do money, it'd be 98.75 + 4.94, which equals about 103.69.

5 0

3 years ago