I need help there’s more than one answer .

Mathematics

1 answer:

myrzilka [38]3 years ago

5 0

Answer:

Step-by-step explanation:

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How do work this out

BabaBlast [244]

We can factor this by using grouping. Take the leading coefficient and multiply it by the constant. In this case we get 5*-7 = -35.

Now we need 2 numbers that add to 2 and multiply to be -35. The numbers are -5 and 7.

So split the 2r into these two terms and group.

(5r^2 - 5r) + (7r - 7)

Factor both groups.

5r(r-1) + 7(r-1)

The factors of (r-1) can be added together to get the answer.

(r-1)(5r+7)

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3 years ago

The Fernandez family drove 273 miles in 5.25 hours. How far would they have driven at that rate in 4 hours?

Vaselesa [24]

The Fernandez family would have driven 208 miles in a rate of 4 hours.

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3 years ago

(1) One side of a Rhombus measures 13 cm what is its perimeter

Ostrovityanka [42]

Answer:

I want to get point

Step-by-step explanation:

can you help

7 0

3 years ago

Carlos is using a number line to add another integer to –4. He begins by showing –4 on the number line, as shown below. Carlos a

kifflom [539]

The integer is 3 or less than 3.

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3 years ago

Read 2 more answers

To obtain information on the corrosion-resistance properties of a certain type of steel conduit, 45 specimens are buried in soil

Fiesta28 [93]

Answer:

The sample has not met the required specification.

Step-by-step explanation:

As the average of the sample suggests that the true average penetration of the sample could be greater than the 50 mils established, we formulate our hypothesis as follow

$H_0$ : The true average penetration is 50 mils

$H_a$ : The true average penetration is > 50 mils

Since we are trying to see if the true average is greater than 50, this is a right-tailed test.

If the level of confidence is α = 0.05 then the $z_\alpha$ score against we are comparing with, is 1.64 (this is because the area under the normal curve N(0;1) to the right of 1.64 is 0.05)