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3 years ago

How I do this someone ples help I need help with 25 and 27.

Mathematics

1 answer:

marta [7]3 years ago

8 0

Number 15 is no solution.

Number 27 is that x has to be between -2 or 2.

This could be explained as -2≤x≤2

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write the equation of a line that is perpendicular to the given line and that passes through given point -x+5y=14;(-5,-2) show y

Brums [2.3K]

For perpendicular lines, m2 = -1/m1.

For line -x + 5y = 14 => 5y = x + 14 => y = 1/5 x + 14/5 => slope = 1/5

m2 = -1 / (1/5) = -5

Required equation is y - (-2) = -5(x - (-5))
y + 2 = -5(x + 5)
5x + y = -25 - 2
5x + y = -27

8 0

4 years ago

A team of three students are working on a language-learning app; they need to develop 300 micro-lessons and 300 micro-tests befo

Olegator [25]

Answer: a) 15 b)

Step-by-step explanation:

Let X be the number of days:

For LESSONS:

Jordan does 10 / day ( 10*X)

Marco 5 / day ( 5*X)

Junyi 5 / day ( 5*X)

For TESTS:

Jordan does 5 / day ( 5*X)

Marco 10 / day ( 10*X)

Junyi 8 / day ( 8*X)

for each they need a total of 300

a) $10X+5X+5X=300 => 20X = 300 => X = 15$ days for the lessons

b) $5X+10X+8X = 300 => 23X = 300 => X = 13.04$ days for the tests

so they need 15 days to finish both tasks

now if Junyi gets sick we just eliminate his contribution

a) $10X+5X=300 => 15X = 300 => X = 20$ days for the lessons

b) $5X+10X = 300 => 15X = 300 => X = 20$ days for the tests

so in 20 days they will finish without him

If jordan works 10 hours a day, we just replace him with 10/24

a) $10(10/24)+5X+5X= 300 => X = 29.58$ days for the lessons

b) $5(10/24)+10X+8X = 300 => X = 16.51$ days for the tests

so at the end to complete both tasks they need 29.58 days

4 0

3 years ago

Somebody please help me with this answer

EastWind [94]

I think it might be b. I'm super sorry if I'm wrong I tried my best :(

6 0

3 years ago

Read 2 more answers

A line has a slope of -3/2 and has a y-intercept of 3.

UNO [17]

Answer:

Step-by-step explanation:

the answer is 2

7 0

3 years ago

What is the value of r? r=4 ft r=8 ft r=16 ft r=32 ft

snow_tiger [21]

Answer:

r = 8 ft

Step-by-step explanation:

Calculate r using the given formula

r = $\sqrt\frac{Area}{\pi } }$ , with Area = 64π

r = $\sqrt{\frac{64\pi }{\pi } }$ ← cancel π on numerator/ denominator

r = $\sqrt{64}$ = 8

3 0

3 years ago

Read 2 more answers